JPH02175039A - Manufacture of body base for injector - Google Patents
Manufacture of body base for injectorInfo
- Publication number
- JPH02175039A JPH02175039A JP33018588A JP33018588A JPH02175039A JP H02175039 A JPH02175039 A JP H02175039A JP 33018588 A JP33018588 A JP 33018588A JP 33018588 A JP33018588 A JP 33018588A JP H02175039 A JPH02175039 A JP H02175039A
- Authority
- JP
- Japan
- Prior art keywords
- hole
- punch
- workpiece
- insertion hole
- insert
- 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
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 238000004080 punching Methods 0.000 claims abstract description 5
- 230000035515 penetration Effects 0.000 claims abstract description 3
- 238000003780 insertion Methods 0.000 claims description 41
- 230000037431 insertion Effects 0.000 claims description 41
- 238000010273 cold forging Methods 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 14
- 238000005422 blasting Methods 0.000 claims description 9
- 238000000137 annealing Methods 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 4
- 238000005242 forging Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 9
- 230000000149 penetrating effect Effects 0.000 abstract 2
- 238000005520 cutting process Methods 0.000 description 13
- 230000003746 surface roughness Effects 0.000 description 10
- 239000010687 lubricating oil Substances 0.000 description 4
- 238000005461 lubrication Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明はインジェクタに用いられるボデー（又はハウジ
ングとも称される。）の基体を製造する方法に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a base of a body (also referred to as a housing) used in an injector.
［従来の技術］
インジェクタは、第４図に示されるように、ボデー４１
のコアー取付用座面４２を基準にしてコアー４３を取付
け、コアー４３にはコイル４４か巻かれ、コアー４３内
に設けたスリーブ４５とバルブアセンブリ４６との間に
ハネ４７を張設し、ボデー４１のストッパープレート取
付用座面４８にストッパープレート４９を当接し、バル
ブアセンブリ４６のアマチャ−５０とコアー４３との間
に隙間５１を設けてバルブアセンブリ４６を作動させる
。そして、コイル４４に流れる電流によりコアー４３を
励磁してバルブアセンブリ４６をバネ４７に抗して作動
し、バルブアセンブリ４６のフランジ５２がストッパー
プレート４９に当るまて吸引されてバルブアセンブリ４
６か全開し、コイル４４の通電時間によって燃料噴射を
制御するここて重要なことは、ボデー４１の前記座面４
２．４８の精度、とりわけ両座面４２．４８間の平行度
である。即ち、両座面４２．４８間の平行度の不良はバ
ルブアセンブリ４６とコアー４３間に傾きを生じ、これ
か前記隙間５１の不均一となってバルブアセンブリ４６
の作動を不安定化する又、アマチャ−挿通用孔５５の精
度、とりわけバルブボデー取付用孔との同心度、面粗度
の精度の良否はバルブアセンブリのアマチャ−５０の円
滑な作動に影響し、上記座面４２．４８の精度と共にイ
ンジェクタの性能を大きく左右する。[Prior Art] As shown in FIG. 4, an injector has a body 41.
A core 43 is installed based on the core mounting seat surface 42 of the core 43, a coil 44 is wound around the core 43, a spring 47 is stretched between a sleeve 45 provided in the core 43 and a valve assembly 46, and the body is attached. The stopper plate 49 is brought into contact with the stopper plate mounting seat 48 of the valve assembly 41, a gap 51 is provided between the armature 50 of the valve assembly 46 and the core 43, and the valve assembly 46 is operated. Then, the core 43 is excited by the current flowing through the coil 44 to operate the valve assembly 46 against the spring 47, and the flange 52 of the valve assembly 46 is attracted until it hits the stopper plate 49, and the valve assembly 4
6 is fully opened and fuel injection is controlled by the energization time of the coil 44. What is important here is that the seat surface 4 of the body 41
The accuracy is 2.48, especially the parallelism between both seating surfaces 42.48. That is, poor parallelism between the two seating surfaces 42 and 48 causes an inclination between the valve assembly 46 and the core 43, and this also causes unevenness in the gap 51, causing the valve assembly 46 to become uneven.
In addition, the accuracy of the armature insertion hole 55, especially the concentricity with the valve body mounting hole and the accuracy of the surface roughness, affect the smooth operation of the armature 50 of the valve assembly. , together with the accuracy of the seating surfaces 42 and 48, greatly affect the performance of the injector.
そして、上記ボデー４１は、従来では低炭素鋼材又は電
磁快削ステンレス系の棒状素材を冷間鍛造して得たワー
クの内、外径を自動施盤などの工作機で切削加工して製
作していた。The body 41 is conventionally manufactured by cutting the inner and outer diameters of a workpiece obtained by cold forging a rod-shaped material of low carbon steel or electromagnetic free-cutting stainless steel using a machine tool such as an automatic lathe. Ta.
［発明が解決しようとする課題］
しかしながら、上記の従来技術においては、ボデー４１
は切削加工によるため、製作に時間を要すると共に切削
しろを要して材料費が嵩むだけてなく、相互に逆向きの
座面４２，４８間の平行度などの精度を出し難く、且つ
螺旋状の傷を生じて面粗度の精度向上を困難化している
。そして、上記平行度などの精度不良は前述のように隙
間５１の精度不良となってバルブアセンブリ４６の作動
不良を生じ、螺施状の傷はその一部の脱落によりインジ
ェクタの燃料噴射の不具合を生じ２面粗度の精度不良は
Ｏリング５３．５４の密着不良による燃料漏れの虞れを
生じ、インジェクタの性能に悪影響を及ぼすものであっ
た。[Problems to be Solved by the Invention] However, in the above-mentioned prior art, the body 41
Since this is done by cutting, it not only takes time to manufacture and requires cutting allowance, which increases the material cost, but also makes it difficult to achieve accuracy such as parallelism between the bearing surfaces 42 and 48, which are oriented in opposite directions, and it is difficult to achieve a spiral shape. This causes scratches and makes it difficult to improve the accuracy of surface roughness. Inaccuracies such as the above-mentioned parallelism lead to inaccuracies in the gap 51 as described above, resulting in malfunction of the valve assembly 46, and the screw-like scratches can cause fuel injection problems in the injector due to part of them falling off. The resulting poor precision of the roughness on two surfaces caused the risk of fuel leakage due to poor adhesion of the O-rings 53 and 54, which adversely affected the performance of the injector.
また、冷間鍛造によりボデ−４１基体を製造しようとし
ても、従来の冷間鍛造では、アマチャ−挿通用孔５５に
破断面等の不具合を生じてアマチャ−５０の円滑な作動
に支障を来したり、上記切削加工による場合と同様に座
面４２．４８間の平行度などに規定の精度が出し難く、
このため、冷間鍛造によるボデ−４１基体の製造は実施
困難な状況にあった。Further, even if an attempt is made to manufacture the body 41 base by cold forging, conventional cold forging causes problems such as fractured surfaces in the armature insertion hole 55, which hinders the smooth operation of the armature 50. Or, as with the above-mentioned cutting process, it is difficult to achieve the specified accuracy in parallelism between the seating surfaces 42 and 48,
For this reason, it has been difficult to manufacture the body 41 base by cold forging.
そこで、本発明は前記アマチャ−挿通用孔や座面を含む
内径部の精度及び面粗度の精度の向上したボデー基体を
容易に製作し、以て上記従来技術の問題点を解決しよう
とするものである。SUMMARY OF THE INVENTION Therefore, the present invention aims to solve the problems of the prior art by easily manufacturing a body base with improved precision of the inner diameter portion including the armature insertion hole and the seat surface, and improved surface roughness precision. It is something.
［課題を解決するための手段］
すなわち、第１の発明は、ワークな冷間鍛造して一端に
バルブボデー取付用孔を、他端にコアー等取付用孔を、
中央に小径なアマチャ−挿通用孔を有するインジェクタ
用ボデー基体を製造する方法において、前記アマチャ−
挿通用孔の形成に際しては該アマチャ−挿通用孔よりも
少し小径な孔を有するインサートを穿孔ポンチに対向し
て配設状態下にアマチャ−挿通用孔を穿孔ポンチにより
貫通直前まで穿孔し、次いで前記インサートを取脱状態
下に前記アマチャ−挿通用孔を打抜ポンチで貫通さすこ
とを特徴とするインジェクタ用ボデー基体の製造方法を
要旨とするものである。第２の発明は、この第１の発明
において、冷間鍛造に先立ちワークの両端面を削成によ
り端面加工することを付加したことを要旨とするもので
ある。これらの場合、インサートはバルブボデー取付用
孔又はコアー等取付用孔の何れの側に配設しても差支え
はない、又、第２の発明における削或は切削、研削のい
ずれても差支えはない。[Means for Solving the Problems] In other words, the first invention is to cold forge a workpiece and form a hole for attaching a valve body at one end and a hole for attaching a core etc. at the other end.
In a method for manufacturing an injector body base having a small-diameter armature insertion hole in the center, the armature
When forming the insertion hole, an insert having a hole slightly smaller in diameter than the armature insertion hole is placed opposite the punch, and the armature insertion hole is drilled with the punch until just before the hole is penetrated. The gist of the present invention is to provide a method for manufacturing an injector body base, characterized in that the armature insertion hole is penetrated with a punch while the insert is removed. The gist of the second invention is that, in the first invention, the workpiece is additionally processed by cutting both end faces of the workpiece prior to cold forging. In these cases, there is no problem in disposing the insert on either side of the valve body mounting hole or the core etc. mounting hole, and there is no problem in either cutting, cutting, or grinding in the second invention. do not have.
第３の発明は、ワークな冷間鍛造して一端にバルブボデ
ー取付用孔を、他端にコアー等取付用孔を、中央に小径
なアマチャ−挿通用孔を有するインジェクタ用ボデー基
体を製造する方法においてワークを焼鈍してから該ワー
クにショツトブラストを行い、次いで該ワークを矯正冷
間鍛造することを特徴とするインジェクタ用ボデー基体
の製造方法を要旨とするものである。The third invention is to cold forge a workpiece to produce an injector body base having a valve body mounting hole at one end, a core etc. mounting hole at the other end, and a small diameter armature insertion hole at the center. The gist of the present invention is a method for manufacturing an injector body base, which comprises annealing the workpiece, subjecting the workpiece to shot blasting, and then straightening cold forging the workpiece.
［作 用］
第１の発明にあっては、アマチャ−挿通用孔の形成時に
、穿孔ポンチにより押された材料の殆どかインサートの
孔に前方押出されることとなって、穿孔ポンチの負荷か
軽減され、アマチャ−挿通用孔か破断を防止されつつ貫
通直前まで穿孔される。又、この前方押出によりワーク
の穿孔部分以外の形態に殆ど変化がなく、次の成形を容
易化し、又、この貫通直前までの穿孔によりアマチャ−
挿通用孔の底部か薄くなると共に硬度を増しているため
１次工程での該底部の打ち抜きがパリの発生の防止下に
円滑に行われる。[Function] In the first invention, when forming the armature insertion hole, most of the material pressed by the punch is pushed forward into the hole of the insert, reducing the load of the punch. The armature insertion hole is drilled until just before penetration while being prevented from breaking. In addition, due to this forward extrusion, there is almost no change in the shape of the workpiece other than the perforated part, which facilitates the next forming.
Since the bottom of the insertion hole is thinner and has increased hardness, punching of the bottom in the first step can be carried out smoothly while preventing the occurrence of burrs.
第２の発明にあっては、更に、冷間鍛造に先立ちワーク
の両端な削成により端面加工することにより、ワークか
切断時の破断層を取除かれて前記アマチャ−挿通用孔な
どの内径部の面粗度の精度を向上させている。In the second invention, further, by performing end face processing by grinding both ends of the workpiece prior to cold forging, the fracture layer at the time of cutting is removed from the workpiece, and the inner diameter of the armature insertion hole, etc. is removed. The accuracy of the surface roughness of the parts has been improved.
第３の発明にあっては、矯正冷間鍛造に先立って焼鈍に
より残留応力を除かれたワークにショツトブラストを行
うことにより、ワークの全表面か僅かな表面硬化と無数
の微細な凹部を生じることとなるため次工程の矯正冷間
鍛造において金型に対するワークの接触表面積か少なく
なり、該矯正冷間鍛造を無潤滑に近い状態で行うことが
できた。この無潤滑に近い状態での矯正冷間鍛造は金型
とワークとの間に潤滑油の厚い被膜が存在しないためワ
ークが金型に沿って精度よく成形されることとなる。In the third invention, by performing shot blasting on the workpiece from which residual stress has been removed by annealing prior to corrective cold forging, the entire surface of the workpiece is slightly hardened and countless minute recesses are created. As a result, the contact surface area of the workpiece with the die in the next step of straightening cold forging was reduced, and the straightening cold forging could be performed in a nearly non-lubricated state. In this straightening cold forging in a state close to no lubrication, there is no thick film of lubricating oil between the die and the workpiece, so the workpiece is formed with high accuracy along the die.
［実施例］
次に本発明の実施例を第１図乃至第３図を参照して説明
する。[Example] Next, an example of the present invention will be described with reference to FIGS. 1 to 3.
本例は素材として電磁ステンレス鋼又は低炭素鋼のコイ
ル材を用い、該コイル材を冷間鍛造用ヘッダーで所要長
に切断して棒状ワークＷとなしく第１図ａ）、該棒状ワ
ークＷを成形して鍛造用ワークＷを作る（第１図ｂ）。In this example, a coil material of electromagnetic stainless steel or low carbon steel is used as the material, and the coil material is cut into the required length with a cold forging header to form a bar-shaped workpiece W (Fig. 1a). A forging work W is made by molding (Fig. 1b).
次にこのワークＷの両端面１、２を研削するか又は切削
する（第１図ｃ ） ｅこの削成により両端面１．２か
切断時の破断層を取除かれて面粗度の精度を向上し、後
工程の冷間鍛造における穿孔時の孔の面粗度の精度を向
上させ、破断層からする孔面の剥離現象を防止する。Next, both end surfaces 1 and 2 of this workpiece W are ground or cut (Fig. 1 c). By this grinding, the fracture layer at the time of cutting is removed from both end surfaces 1.2, and the accuracy of the surface roughness is improved. This improves the accuracy of the surface roughness of the hole during drilling in the subsequent cold forging process, and prevents the phenomenon of separation of the hole surface from the fracture layer.
次にこのワークＷは洗浄後、残留応力の除去と軟化を目
的に中間焼鈍を行い、ショット酸洗いを経て被膜加工を
してトランスファー冷間鍛造用プレスによる成形（第１
図ｄ、ｅ、ｆ、ｇ、ｈ、ｉｊ）を順次行う。この場合、
成形（第１図ｈ）までに一端にコアー等取付用孔３、他
端にバルブボデー取付用孔４を有するワークＷとし、成
形（第１図ｉ、ｊ）において、このワークＷの残留応力
の大きな加工硬化された中底５の中心にアマチャ−挿通
用孔６を押出し穿孔する。Next, after cleaning, this work W is subjected to intermediate annealing for the purpose of removing residual stress and softening, shot pickling, coating processing, and forming with a transfer cold forging press (first
d, e, f, g, h, ij) in sequence. in this case,
The workpiece W has a hole 3 for attaching a core etc. at one end and a hole 4 for attaching a valve body at the other end before forming (Fig. 1h), and the residual stress of this workpiece W during forming (Fig. 1i, j). An armature insertion hole 6 is extruded and bored in the center of the large work-hardened inner sole 5.
この成形（第１図ｉ、ｊ）の工程を第３図により詳しく
説明すると、同図において、２１．２２は可動するポン
チホルダー、２３は穿孔ポンチ、２４．２５はダイス、
２６は孔２７を有するインサートであって、穿孔ポンチ
２３に対向してダイス２４に設けられ、孔２７は穿孔ポ
ンチ２３よりも少し小径、例えば直径比的０．８としで
ある。The process of this molding (Fig. 1 i, j) will be explained in more detail in Fig. 3. In the figure, 21.22 is a movable punch holder, 23 is a perforation punch, 24.25 is a die,
Reference numeral 26 denotes an insert having a hole 27, which is provided in the die 24 opposite to the punch 23, and the hole 27 has a slightly smaller diameter than the punch 23, for example, a diameter ratio of 0.8.
２８．２９はノックアウトカラー、３０は孔３１を有す
る第２インサート、３２は打ち抜きポンチである。28 and 29 are knockout collars, 30 is a second insert having a hole 31, and 32 is a punch.
しかして、ワークＷは、ポンチホルダー２１にてダイス
２４に据込まれ、インサート２６にワークＷの窪み７を
有する中底５が臨む（第３図ａ）、この状態下に穿孔ポ
ンチ２３によりアマチャ−挿通用孔６を貫通直前まで穿
孔する（第３図ｂ）。この穿孔によりワークＷの穿孔ポ
ンチ２３に押されたほとんどの材料８はインサート２６
の孔２７内に押出されてくる。この場合、インサート２
６の孔２７が穿孔ポンチ２３の径よりも少し小さいため
、穿孔しつつあるアマチャ−挿通用孔６の破断を防ぎ、
該アマチャ−挿通用孔６の底９が極限に近く薄い状態ま
て穿孔される。又、この材料８の前方押出により、穿孔
ポンチ２３に加わる圧力が穿孔深さの増大により過大と
ならず、求心作用を生じて穿孔ポンチ２３の押出面３３
か大きくても穿孔ポンチ２３、従ってアマチャ−挿通用
孔６の偏心を防ぎ、穿孔ポンチ２３の損傷も生じ難い状
態にある。The workpiece W is then placed in the die 24 by the punch holder 21, and the inner sole 5 having the recess 7 of the workpiece W faces the insert 26 (FIG. 3a). - Drill the insertion hole 6 until just before it penetrates (Fig. 3b). Most of the material 8 pressed by the punch 23 of the workpiece W by this drilling is inserted into the insert 26.
is pushed out into the hole 27. In this case, insert 2
Since the hole 27 of 6 is slightly smaller than the diameter of the punch 23, the armature insertion hole 6 that is being drilled is prevented from breaking.
The bottom 9 of the armature insertion hole 6 is bored to be as thin as possible. Further, due to the forward extrusion of the material 8, the pressure applied to the punch 23 does not become excessive due to an increase in the depth of the hole, and a centripetal action is generated, so that the extrusion surface 33 of the hole punch 23 is prevented from becoming excessive.
Even if the hole punch 23 is large, the eccentricity of the punch 23 and therefore the armature insertion hole 6 is prevented, and damage to the punch 23 is less likely to occur.
次に、アマチャ−挿通用孔６よりも少し大径な孔３１を
有する第２インサート３０にワークＷのバルブボデー取
付用孔４を挿嵌した状態下に打抜ポンチ３２でアマチャ
−挿通用孔６の底９を打抜く（第３図ｃ）、この場合、
鎖孔の底９は前工程により硬度が上昇しているため、打
抜き易く、アマチャ−挿通用孔６の打抜部にはハリの発
生か殆ど見られない。Next, with the valve body mounting hole 4 of the workpiece W inserted into the second insert 30 having a hole 31 with a slightly larger diameter than the armature insertion hole 6, use a punch 32 to insert the armature insertion hole. Punch out the bottom 9 of 6 (Fig. 3 c), in this case,
Since the hardness of the bottom 9 of the chain hole has been increased by the previous process, it is easy to punch out, and there is hardly any bulge in the punched portion of the armature insertion hole 6.
なお、このアマチャ−挿通用孔６の成形は、上記成形（
第１図ｉ、ｊ）に替えて、第２図ａ、 ｂに示すように
、逆方向から行っても良い、即ち、ワークＷのコアー等
取付用孔３に上記同様の孔を有するインサートを配設状
態下にバルブボデー取付用孔４の側から上記同様の穿孔
ポンチでアマチャ−挿通用孔６を上記同様に貫通直前ま
て穿孔しく第２図ａ）１次いでコアー等取付用孔３に第
２インサートな配設状態下にバルブボデー取付用孔４の
側から打抜きポンチでアマチャ−挿通用孔６を貫通する
（第２図ｂ）。In addition, the molding of this armature insertion hole 6 is performed by the above-mentioned molding (
Instead of (i, j) in Fig. 1, it may be done from the opposite direction as shown in Fig. 2 (a), (b), that is, by inserting an insert having a hole similar to the above into the hole 3 for attaching the core, etc. of the workpiece W. In the installed state, use the same drilling punch as above to drill the armature insertion hole 6 from the side of the valve body mounting hole 4 until just before the hole 6 is penetrated in the same manner as above. With the second insert in place, the armature insertion hole 6 is penetrated from the side of the valve body mounting hole 4 using a punch (FIG. 2b).
上記の冷間鍛造においてワークＷはアマチャ−挿通用孔
６、コアー等取付用孔３、バルブボデー取付用孔４に大
きな残留応力を残すので、次にワークＷを洗浄後、残留
応力除去の焼鈍を行う。なお、本例ワークＷの場合、こ
の焼鈍温度は６００〜８００℃が適当である。In the above-mentioned cold forging, the workpiece W leaves large residual stress in the armature insertion hole 6, the core etc. mounting hole 3, and the valve body mounting hole 4, so after cleaning the workpiece W, annealing is performed to remove the residual stress. I do. In addition, in the case of the workpiece W of this example, the appropriate annealing temperature is 600 to 800°C.
次に、この焼鈍されたワークＷはショツトブラストを行
い、前面に僅かな表面硬化と無数の微細な凹部ｌＯを有
する凹凸面を形成し、金型接触面積を少なくしたワーク
Ｗを得る（第１図ｋ）。Next, this annealed workpiece W is subjected to shot blasting to form a roughened surface with slight surface hardening and countless minute recesses IO on the front surface, thereby obtaining a workpiece W with a reduced mold contact area (first Figure k).
このショツトブラスト処理の具体例として１粒径約０．
２ｍｍの鋼球製ショット玉を用い、該ショット玉を噴射
速度的６０ ｍ ／ ｓ、噴射量１２０Ｋｇ／分でワー
クＷ約１６００個、重量換算６０にｇに１０分間吹付け
、ショツトブラスト前に面粗度か外径面１１で１．５〜
３ｐｍ、内径面１２て０．７〜０．８μｍのワークＷに
おいて、ショツトブラスト後に微細な凹部ｌＯ深さか外
径面１１て約５〜８μｍ、内径面１２で約３〜４ｇｍの
凹凸面のワークＷが形成された。又、このシヨ・ントブ
ラスト処理において、ワークＷの表面硬度が処理前に平
均値で１４５８ｍＶであったものが処理後には１５８Ｈ
ｍＶとなった。なお、上記ショット玉は粒径が余り小さ
くなるとショツトブラスト処理の作業能率が低下し、大
きくなりすぎるとワークＷの上記凹ｆｆ１１．００）Ｍ
凸面の面粗度の精度が低下して許容値以内ヒ納まらなく
なってしまう次に、冷間鍛造用プレスにより上記のワー
クＷを無潤滑に近い極〈僅かな潤滑油付着の下に矯正冷
間鍛造を行い、精度を十分に保証された金型に沿ったボ
デー基体Ｙを得る（第１図１）。この場合、ワークＷは
矯正冷間鍛造に先立って硬度を増すと共に前記凹凸面が
形成されて、金型との接触面積を少なくしているため、
無潤滑に近い極く僅かな潤滑油の付着の下においても金
型にワークＷか爆着などの不具合を生ずることなく矯正
冷間鍛造が可能となり、潤滑油かワークＷと金型との間
に被膜を形成することによるワークＷの精度低下の弊害
が解消された。As a specific example of this shot blasting treatment, one particle size is about 0.
Using a shot ball made of 2 mm steel balls, the shot ball was sprayed at a spray speed of 60 m/s and a spray amount of 120 kg/min for about 1600 workpieces W, weight equivalent to 60 g, for 10 minutes, and the surface was sprayed before shot blasting. Roughness or outer diameter surface 11: 1.5~
3pm, the workpiece W has an uneven surface of 0.7 to 0.8 μm on the inner diameter surface 12, and after shot blasting, the depth of the fine recesses 10 is approximately 5 to 8 μm on the outer diameter surface 11, and approximately 3 to 4 gm on the inner diameter surface 12. W was formed. In addition, in this shot blasting process, the surface hardness of the workpiece W, which was 1458 mV on average before the process, decreased to 158 mV after the process.
It became mV. Note that if the particle size of the shot balls becomes too small, the efficiency of the shot blasting process will decrease, and if the particle size becomes too large, the above-mentioned concave ff11.00) M of the work W will occur.
The accuracy of the surface roughness of the convex surface deteriorates and it no longer falls within the allowable value.Next, the above-mentioned workpiece W is subjected to cold straightening with a slight amount of lubricating oil adhering to a near non-lubricated state using a cold forging press. Forging is performed to obtain a body base Y that conforms to the mold with sufficiently guaranteed accuracy (FIG. 1). In this case, the workpiece W has increased hardness prior to corrective cold forging, and the uneven surface is formed to reduce the contact area with the die.
It is now possible to perform straightening cold forging without causing defects such as explosion adhesion of the workpiece W to the mold even when there is a very small amount of lubricant attached, which is close to no lubrication. This eliminates the problem of decreased accuracy of the workpiece W caused by forming a film on the surface of the workpiece.
このようにして得られたボデー基体Ｙにあっては、アマ
チャ−挿通用孔６が貫通孔であるに拘らずハリの発生か
殆ど見られず、冷間鍛造による穿孔によっているため、
同心度等の製作精度を向上している。又、矯正冷間鍛造
を無潤滑に近い状態で行うことかできたため、潤滑油か
ワークＷと矯正冷間鍛造の金型との間に被膜を形成する
ことを防止して、バルブボデー取付用孔４、コアー等取
付用孔３などの内径部の製作精度、並びに面粗度の精度
の良好な製品のボデー基体Ｙが得られた。In the body base Y obtained in this manner, although the armature insertion hole 6 is a through hole, hardly any firmness is observed, and since the hole is formed by cold forging,
Manufacturing accuracy such as concentricity has been improved. In addition, since straightening cold forging could be performed in a state close to no lubrication, it was possible to prevent lubricating oil from forming a film between the workpiece W and the straightening cold forging die, and to prevent the formation of a film between the workpiece W and the straightening cold forging die. A product body base Y with good manufacturing accuracy of the inner diameter parts such as the hole 4 and the core mounting hole 3 and the accuracy of the surface roughness was obtained.
なお、このボデー基体Ｙは溝部５６（第４図参照）等の
外径部の必要個所の切削加工を経てインジェクタ用ボデ
ーとする。Note that this body base Y is made into an injector body by cutting necessary portions of the outer diameter portion such as the groove portion 56 (see FIG. 4).
［発明の効果］
上記のように、第１の発明においては、アマチャ−挿通
用孔が破断やハリの発生の防止下に形成されるのて、該
アマチャ−挿通用孔の製作精度、面粗度の精度を向上で
き、第２の発明においては更に、端面加工によりワーク
の切断時の破断層を取除かれているので、アマチャ−挿
通用孔などの内径部の面粗度の精度を向上させ、破断層
からする孔面の剥離現象を防止でき、第３の発明におい
ては、矯正冷間鍛造を無潤滑に近い状態で行うことかで
き、このため矯正冷間鍛造時の金型とワークとの間に潤
滑油の厚い被膜が存在しないため、上記金型に沿った精
度の良い製品のボデー基体が得られる。又、これら発明
においては切削加工と異なり冷間鍛造によりボデー基体
が能率良く得られる。[Effects of the Invention] As described above, in the first invention, since the armature insertion hole is formed while preventing breakage and generation of bulges, the manufacturing accuracy and surface roughness of the armature insertion hole are improved. In the second invention, since the fracture layer when cutting the workpiece is removed by end face processing, the accuracy of the surface roughness of the inner diameter part such as the armature insertion hole is improved. This makes it possible to prevent the phenomenon of separation of the hole surface from the fracture layer, and in the third invention, it is possible to carry out straightening cold forging in a state close to no lubrication. Since there is no thick film of lubricating oil between the two, it is possible to obtain a product body base that conforms to the mold with high precision. Furthermore, in these inventions, the body base can be efficiently obtained by cold forging, unlike cutting.
第１図ａ〜！は本発明の実施例の工程順に示したワーク
の側断面図、第２図ａ、ｂは同上例の一部工程の変形例
の工程順に示したワークの側断面図、第３図ａ〜Ｃは同
上例の冷間鍛造工程の一部を工程順に示した縦断面図、
第４図はインジェクタの説明用縦断面図である。
ｌ・・・端面、２・・・端面、３・・・コアー等取付用
孔、４・・・バルブボデー取付用孔、６・・・アマチャ
−挿通用孔、２３・・・穿孔ポンチ、２６・・・インサ
ート、２７・・・孔、３２・・・打抜きポンチ、Ｗ・・
・ワーク、Ｙ・・・ボデー基体Figure 1 a~! 2A and 2B are side sectional views of a workpiece shown in the order of steps according to an embodiment of the present invention, FIGS. is a vertical cross-sectional view showing a part of the cold forging process in the same process order in the above example,
FIG. 4 is an explanatory longitudinal sectional view of the injector. l... End face, 2... End face, 3... Hole for mounting core etc., 4... Hole for valve body mounting, 6... Hole for armature insertion, 23... Drilling punch, 26 ...insert, 27...hole, 32...punching punch, W...
・Work, Y...Body base
Claims (1)
を、他端にコアー等取付用孔を、中央に小径なアマチヤ
ー挿通用孔を有するインジェクタ用ボデー基体を製造す
る方法において、前記アマチヤー挿通用孔の形成に際し
ては該アマチヤー挿通用孔よりも少し小径な孔を有する
インサートを穿孔ポンチに対向して配設状態下にアマチ
ヤー挿通用孔を穿孔ポンチにより貫通直前まで穿孔し、
次いで前記インサートを取脱状態下に前記アマチヤー挿
通用孔を打抜ポンチで貫通さすことを特徴とするインジ
ェクタ用ボデー基体の製造方法。 ２、ワークを冷間鍛造して一端にバルブボデー取付用孔
を、他端にコアー等取付用孔を、中央に小径なアマチヤ
ー挿通用孔を有するインジェクタ用ボデー基体を製造す
る方法において、前記冷間鍛造に先立ち前記ワークの両
端面を削成により端面加工し、前記アマチヤー挿通用孔
の形成に際しては該アマチヤー挿通用孔よりも少し小径
な孔を有するインサートを穿孔ポンチに対向して配設状
態下にアマチヤー挿通用孔を穿孔ポンチにより貫通直前
まで穿孔し、次いで前記インサートを取脱状態下に前記
アマチヤー挿通用孔を打抜ポンチで貫通さすことを特徴
とするインジェクタ用ボデー基体の製造方法。 ３、ワークを冷間鍛造して一端にバルブボデー取付用孔
を、他端にコアー等取付用孔を、中央に小径なアマチヤ
ー挿通用孔を有するインジェクタ用ボデー基体を製造す
る方法において、ワークを焼鈍してから該ワークにショ
ットブラストを行い、次いで該ワークを矯正冷間鍛造す
ることを特徴とするインジェクタ用ボデー基体の製造方
法。[Claims] 1. Manufacture a body base for an injector that has a valve body mounting hole at one end, a core etc. mounting hole at the other end, and a small diameter armature insertion hole in the center by cold forging a workpiece. In the method of forming the armature insertion hole, an insert having a hole slightly smaller in diameter than the armature insertion hole is placed opposite the punch, and the armature insertion hole is formed with the punch until just before it is penetrated. perforated,
A method for producing a body base for an injector, comprising: then, with the insert removed, the armature insertion hole is penetrated with a punch. 2. In the method of manufacturing an injector body base body having a valve body mounting hole at one end, a core etc. mounting hole at the other end, and a small diameter armature insertion hole at the center by cold forging a workpiece, Prior to forging, both end faces of the workpiece are processed by grinding, and when forming the armature insertion hole, an insert having a hole slightly smaller in diameter than the armature insertion hole is placed opposite to the punch. A method for producing a body base for an injector, which comprises: drilling an armature insertion hole at the bottom with a punch until just before penetration; and then, with the insert removed, punching the armature insertion hole through with a punch. 3. In a method of cold forging a workpiece to produce an injector body base having a valve body mounting hole at one end, a core etc. mounting hole at the other end, and a small diameter armature insertion hole in the center, the workpiece is 1. A method for producing a body base for an injector, comprising subjecting the workpiece to shot blasting after annealing, and then straightening cold forging the workpiece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63330185A JPH0685957B2 (en) | 1988-12-27 | 1988-12-27 | Manufacturing method of body for injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63330185A JPH0685957B2 (en) | 1988-12-27 | 1988-12-27 | Manufacturing method of body for injector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02175039A true JPH02175039A (en) | 1990-07-06 |
| JPH0685957B2 JPH0685957B2 (en) | 1994-11-02 |
Family
ID=18229780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63330185A Expired - Lifetime JPH0685957B2 (en) | 1988-12-27 | 1988-12-27 | Manufacturing method of body for injector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0685957B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005115653A1 (en) * | 2004-05-28 | 2005-12-08 | Ngk Insulators, Ltd. | Method for forming metallic glass |
| JP2006181577A (en) * | 2004-12-24 | 2006-07-13 | Denso Corp | Method for producing piping parts for high pressure and piping parts for high pressure |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6994637B1 (en) * | 2020-12-22 | 2022-01-14 | 株式会社テクノクラート | Manufacturing method of snow-melting nozzle |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01317649A (en) * | 1988-06-17 | 1989-12-22 | Miyama Tool Kk | Production of core base body for injector |
-
1988
- 1988-12-27 JP JP63330185A patent/JPH0685957B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01317649A (en) * | 1988-06-17 | 1989-12-22 | Miyama Tool Kk | Production of core base body for injector |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005115653A1 (en) * | 2004-05-28 | 2005-12-08 | Ngk Insulators, Ltd. | Method for forming metallic glass |
| JPWO2005115653A1 (en) * | 2004-05-28 | 2008-03-27 | 日本碍子株式会社 | Metal glass forming method |
| US7708844B2 (en) | 2004-05-28 | 2010-05-04 | Ngk Insulators, Ltd. | Method of forming metallic glass |
| JP4693772B2 (en) * | 2004-05-28 | 2011-06-01 | 日本碍子株式会社 | Metal glass forming method |
| JP2006181577A (en) * | 2004-12-24 | 2006-07-13 | Denso Corp | Method for producing piping parts for high pressure and piping parts for high pressure |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0685957B2 (en) | 1994-11-02 |
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