JPH01152280A - Pretreatment before cold sizing - Google Patents
Pretreatment before cold sizingInfo
- Publication number
- JPH01152280A JPH01152280A JP30953387A JP30953387A JPH01152280A JP H01152280 A JPH01152280 A JP H01152280A JP 30953387 A JP30953387 A JP 30953387A JP 30953387 A JP30953387 A JP 30953387A JP H01152280 A JPH01152280 A JP H01152280A
- Authority
- JP
- Japan
- Prior art keywords
- film
- sizing
- metal soap
- workpiece
- cold
- 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
- 238000004513 sizing Methods 0.000 title claims abstract description 45
- 239000002184 metal Substances 0.000 claims abstract description 31
- 229910052751 metal Inorganic materials 0.000 claims abstract description 31
- 239000000344 soap Substances 0.000 claims abstract description 31
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 claims abstract description 5
- 229910000165 zinc phosphate Inorganic materials 0.000 claims abstract description 5
- 238000002203 pretreatment Methods 0.000 claims description 5
- 238000005422 blasting Methods 0.000 abstract description 5
- 239000010408 film Substances 0.000 description 32
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000000265 homogenisation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000037228 dieting effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/82—After-treatment
- C23C22/83—Chemical after-treatment
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Forging (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、予備成形を終了したワークに冷間サイジン
グを施す場合の前処理方法に関するものであり、とくに
は、サイジング精度の十分なる向上をもたらすものであ
る。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a pretreatment method for performing cold sizing on a preformed workpiece, and in particular, it relates to a pretreatment method for cold sizing a workpiece that has been preformed. It is something that brings.
（従来の技術）
従来の一般的なこの種の冷間サイジングは、予備成形を
終了したワーク、たとえば、第４図（ａ）に示すような
、自動車用ディファレンシャルギヤのためのワークＷ、
とくには、その歯形形成表面１に、リン酸亜鉛皮膜およ
び金属石鹸皮膜を順次に成した後、そのワークＷの歯形
形成表面１を、第５図（ａ）に断面図で示すサイジング
ダイ２のキャビティ３内へそのまま嵌め込んで鍛圧する
ことにより行われている。(Prior Art) This type of conventional cold sizing is performed on a preformed workpiece, for example, a workpiece W for an automobile differential gear as shown in FIG. 4(a),
In particular, after sequentially forming a zinc phosphate film and a metal soap film on the tooth profile forming surface 1, the tooth profile forming surface 1 of the workpiece W is cut into the sizing die 2 shown in cross section in FIG. 5(a). This is done by inserting it into the cavity 3 as it is and forging it.
なおここで、かかる冷間サイジングに際して、ワークＷ
から、サイジングダイ２のキャビティ周面に転移した金
属石鹸は、エアブロ−によって、サイジング毎にそこか
ら除去される。Note that during this cold sizing, the work W
The metal soap transferred to the circumferential surface of the cavity of the sizing die 2 is removed from there by air blowing during each sizing.
（発明が解決しようとする問題点）
ところが、かかる従来技術にあっては、第４図（ｂ）に
拡大断面図で示すように、厚さむらが相当大きく、しか
も、膜厚が比較的厚い金属石鹸皮膜４をワークＷの歯形
形成表面１に付着させたままの状態にて冷間サイジング
を行っていることから、そのワークＷを、サイジングダ
イ２のキャビティ３へ嵌め込むに際し、第５図（ｂ）に
拡大断面図で示すように、金属石鹸皮膜４が、とくには
その厚さむらによって、歯形形成表面１の、キャビティ
内への正確な嵌め合わせを阻害することが多く、かかる
状態の下でサイジングを行った場合には、金属石鹸皮膜
４が、サイジングダイ２の一部であるかの如く作用して
、加工精度の低下をもたらすという問題があった。(Problems to be Solved by the Invention) However, in this prior art, as shown in the enlarged cross-sectional view in FIG. Since cold sizing is performed with the metal soap film 4 still attached to the tooth profile forming surface 1 of the workpiece W, when the workpiece W is fitted into the cavity 3 of the sizing die 2, as shown in FIG. As shown in the enlarged cross-sectional view in (b), the metal soap film 4 often obstructs accurate fitting of the tooth profile forming surface 1 into the cavity, especially due to its uneven thickness. When sizing was performed below, there was a problem in that the metal soap film 4 acted as if it were a part of the sizing die 2, resulting in a decrease in processing accuracy.
そしてまた、冷間サイジングの終了後にもなお、歯形形
成表面１に付着している金属石鹸皮膜４は、冷間サイジ
ングを終了したワークＷに背面ターニングを施すために
、その歯形部分を、第６図（ａ）に断面図で示すような
加工用シート５に、加圧下にて着座させる場合において
も、その金属石鹸皮膜４の厚さむらの故に、第６図（ｂ
）に拡大断面図で示すように、歯形部分の、加工用シー
ト５への正確な着座が妨げられることになり、これがた
め、ターニング精度もまた低下するという問題があった
。Further, even after the cold sizing is completed, the metal soap film 4 still attached to the tooth profile forming surface 1 is removed from the tooth profile part in order to perform back turning on the workpiece W that has completed the cold sizing. Even when the processing sheet 5 as shown in the cross-sectional view in FIG. 6(a) is seated under pressure, due to the uneven thickness of the metal soap film 4,
As shown in the enlarged cross-sectional view in ), this prevents the tooth-shaped portion from accurately seating on the processing sheet 5, resulting in a problem in that turning accuracy also decreases.
この発明は、従来技術のかかる問題点に着目してなされ
たものであり、とくには、冷間サイジングの加工精度を
十分に向上させ、併せて、背面ターニングの精度をもま
た十分に向上させることができる、冷間サイジングの前
処理方法を提供するものである。This invention was made by focusing on the problems of the prior art, and in particular, it is an object to sufficiently improve the machining accuracy of cold sizing, and also to sufficiently improve the accuracy of back turning. The present invention provides a pretreatment method for cold sizing.
（問題点を解決するための手段）
この発明の、冷間サイジングの前処理方法は、予備成形
を終了したワーク、なかでもその成形表面に、リン酸亜
鉛皮膜および金属石鹸皮膜を順次に形成するとともに、
その金属石鹸皮膜の膜厚を、ショツトブラスト、湯洗、
酸洗などの均一化処理によって、全体にわたって十分均
一ならしめ、しかる後、冷間サイジングを行うものであ
る。(Means for Solving the Problems) The cold sizing pretreatment method of the present invention sequentially forms a zinc phosphate film and a metal soap film on the preformed workpiece, particularly on the molded surface. With,
The thickness of the metal soap film was determined by shot blasting, hot water washing,
A homogenization treatment such as pickling is performed to make the entire surface sufficiently uniform, and then cold sizing is performed.
（作 用）
この発明方法によれば、ワークに形成した金属石鹸皮膜
を均一化処理することによって、その膜厚を十分均一な
ものとすることができるとともに、極めて薄いものとす
ることができるので、ワークに冷間サイジングを施すに
際して、ワークの成形表面と、サイジングダイのキャビ
ティ周面との間に位置するその金属石鹸皮膜が、ワーク
Ｗの、サイジングダイの適正なる嵌め込みを妨げるおそ
れがなく、これがため、冷間サイジングを常に高い精度
にて行うことができる。(Function) According to the method of the present invention, by uniformizing the metal soap film formed on the workpiece, the thickness of the metal soap film can be made sufficiently uniform, and it can also be made extremely thin. When performing cold sizing on the workpiece, there is no risk that the metal soap film located between the molding surface of the workpiece and the circumferential surface of the cavity of the sizing die will interfere with proper fitting of the workpiece W into the sizing die. Therefore, cold sizing can always be performed with high accuracy.
なおこのことは、背面ターニングに際してもまた同様で
あり、ワークの歯形部分と、加工用シートとの間に挟み
込まれる金属石鹸皮膜の膜厚が、十分均一で、かつ極め
て薄肉であることにより、その歯形部分の、加工用シー
トへの常に適正なる着座をもたらして、ターニング精度
を著しく向上させることができる。The same thing applies when turning the back surface, since the thickness of the metal soap film sandwiched between the tooth profile of the workpiece and the processing sheet is sufficiently uniform and extremely thin. The tooth profile portion is always properly seated on the processing sheet, and turning accuracy can be significantly improved.
（実施例） 以下にこの発明の実施例を図面に基づいて説明する。(Example) Embodiments of the present invention will be described below based on the drawings.
第１図はこの発明の一実施例を示す工程図であり、図中
二点鎖線にて囲んだ部分がこの発明に係る部分である。FIG. 1 is a process diagram showing an embodiment of the present invention, and the portion surrounded by the two-dot chain line in the figure is the portion according to the present invention.
たとえば、自動車用ディファレンシャルギヤを製造する
に際しては、はじめに、ＳＣＭ４１８Ｈからなる材料を
所要の寸法に切断してワークとし、次いで、そのワーク
を、８００〜９００℃の加熱下で温間鍛造することによ
って歯の予備成形を行い、その後、予備成形済みのその
ワークに対し、０．５〜１．０φの鋼球によるショツト
ブラストを行って、そこからスケールを除去する。そし
てまた、ワークの磁気探傷および外観底チエツクと、無
酸化規準とを引き続いて順次に行い、この無酸化規準で
は、ワークを９２０°Ｃに１時間加熱した後に放冷する
ことによって、それの硬度低下をもたらす。For example, when manufacturing differential gears for automobiles, first, a material made of SCM418H is cut into the required dimensions to form a workpiece, and then the workpiece is warm-forged under heating at 800 to 900°C. After that, the preformed workpiece is shot blasted with a steel ball of 0.5 to 1.0φ to remove scale. Then, magnetic flaw detection and external bottom check of the workpiece and oxidation-free standard were carried out sequentially, and in this oxidation-free standard, the hardness of the workpiece was determined by heating the workpiece to 920°C for 1 hour and then allowing it to cool. bring about a decline.
さらに、そのワーク、とくにはそれの歯形形成表面に、
ワークのサイジングダイに対するすべりを良くして、そ
のワークのかじりを防止する目的の下で、リン酸亜鉛皮
膜および金属石鹸皮膜を順次に形成し、そしてその金属
石鹸皮膜の膜厚を、たとえば、平均粒径が約０．３胴の
鋼球を１〜２分間ショツトブラストすることからなる均
一化処理によって、ワークの全体にわたって十分均一な
らしめ、併せて、極めて薄いものとする。なおここで、
膜厚の均一化は、鋼球が、金属石鹸皮膜の、とくに凸部
を積極的に研掃することによって実現されることになる
。Furthermore, the workpiece, especially its tooth profile forming surface,
For the purpose of improving the sliding of the work against the sizing die and preventing galling of the work, a zinc phosphate film and a metal soap film are sequentially formed, and the film thickness of the metal soap film is, for example, averaged. A homogenization process consisting of shot blasting steel balls with a grain size of approximately 0.3 mm for 1 to 2 minutes ensures that the workpiece is sufficiently uniform throughout and is also extremely thin. Furthermore, here,
Uniform film thickness is achieved by actively grinding the metal soap film, especially the convex portions, with the steel ball.
このことによれば、第２図に拡大断面図で示すように、
ワークＷの予備成形歯形１１０表面に付着した金属石鹸
皮膜１２の膜厚が、十分に均一化されるとともに、著し
く薄肉化されるので、引き続いて、そのワークＷに冷間
サイジングを施すに際し、その金属石鹸皮膜１２は、第
３図に拡大断面図で示すように、ワークＷ、ひいては、
その予備成形歯形１１の、サイジングダイ２への適正な
る嵌め合わせを十分に担保することができる。According to this, as shown in the enlarged cross-sectional view in FIG.
The thickness of the metal soap film 12 adhering to the surface of the preformed tooth profile 110 of the workpiece W is sufficiently uniform and is significantly thinned, so that when the workpiece W is subsequently subjected to cold sizing, As shown in the enlarged cross-sectional view in FIG.
Proper fitting of the preformed tooth profile 11 into the sizing die 2 can be sufficiently ensured.
従って、冷間サイジングは、サイジングダイの一部の如
くに作用する、金属石鹸の均一薄膜を介して、極めて高
い精度にて行われることになる。Cold sizing is therefore performed with extremely high precision through a uniform thin film of metal soap that acts like part of the sizing die.
なおここでは、ショツトブラストによる均一化処理によ
って、金属石鹸皮膜１２の膜厚の均一化と、薄肉化との
両者をもたらすこととしているが、この発明では、少な
くとも膜厚の均一化をもたらし、そして、その膜厚を考
慮に入れてサイジングダイ２を構成することにより、そ
の目的を十分に達成することができる。Here, it is assumed that the uniformity treatment by shot blasting brings about both a uniform thickness of the metal soap film 12 and a thinning of the metal soap film 12. However, in this invention, at least the uniformity of the film thickness is brought about, and By configuring the sizing die 2 taking the film thickness into consideration, the purpose can be fully achieved.
このようにして高精度の冷間サイジングを行った後は、
たとえば、歯溝のふれ、ピッチ誤差などについての精度
チエツクを行い、この精度チエツクをパスしたワークＷ
に対しては、それを、従来例にて述べたと同様の加工用
シートに着座させて背面ターニングを施す。After performing high-precision cold sizing in this way,
For example, an accuracy check is performed on tooth groove runout, pitch error, etc., and the workpiece W that passes this accuracy check is
, the back surface is turned by placing it on a processing sheet similar to that described in the conventional example.
ここで、この背面ターニングに際しては、ワークＷは、
冷間サイジングの終了後にもなおその表面に付着してい
る金属石鹸皮膜１２が、十分均一な厚さを有することに
より、加工用シートに、第３図に示した場合とほぼ同様
に、高い精度にて着座することができ、これがため、タ
ーニング精度をもまた著しく向上させることができる。Here, during this back turning, the workpiece W is
The metal soap film 12 that remains attached to the surface even after cold sizing has a sufficiently uniform thickness, so that the sheet for processing can be processed with high precision, almost the same as in the case shown in FIG. The turning accuracy can also be significantly improved.
そして、上述したようにして、高精度の冷間サイジング
および背面ターニングを施されたワークＷに対しては、
浸炭焼入れおよび研摩を順次に施し、引き続いて、最終
精度チエツクを行うことによって、一連の鍛造作業を終
了する。Then, as described above, for the workpiece W that has been subjected to highly accurate cold sizing and back turning,
The series of forging operations is completed by successively carburizing and quenching and polishing, followed by a final accuracy check.
以上に述べたようにして鍛造製品を製造する場合には、
とくには、金属石鹸皮膜１２の、膜厚の均一化処理によ
って、冷間サイジングおよび背面ターニングの精度を、
従来技術に比して著しく高めることができるので、最終
精度チエツクに際する検査合格率が大きく向上されるこ
とになる。When manufacturing forged products as described above,
In particular, by uniformizing the thickness of the metal soap film 12, the accuracy of cold sizing and back turning can be improved.
Since this can be significantly improved compared to the prior art, the inspection passing rate in the final accuracy check can be greatly improved.
なお、上述したところにおいては、金属石鹸皮膜の均一
化処理を、ショツトブラストにて行うこととしているが
、その均一化処理を、湯洗もしくは酸洗にて行っても、
ショツトブラストと同様の作用効果をもたらすことがで
きる。In addition, in the above description, the uniform treatment of the metal soap film is performed by shot blasting, but even if the uniform treatment is performed by hot water washing or pickling,
It can provide the same effects as shot blast.
（発明の効果）
従って、この発明によれば、とくには、ワーク表面に形
成した金属石鹸皮膜に対する均一化処理によって、その
膜厚を十分均一ならしめることにより、ワークのサイジ
ングダイへの嵌め込みおよび加工用シートへの着座を、
ともに常に適正に行うことができるので、冷間サイジン
グおよび背面ターニングを、従来技術に比して著しく高
精度にて行うことができる。(Effects of the Invention) Therefore, according to the present invention, in particular, by uniformizing the metal soap film formed on the surface of the workpiece to make the film thickness sufficiently uniform, it is possible to fit the workpiece into the sizing die and process it. sitting on the seat for
Since both can be performed properly at all times, cold sizing and back turning can be performed with significantly higher precision than in the prior art.
第１図はこの発明の実施例を示す工程図、第２図は金属
石鹸皮膜の均一化状態を示す拡大断面図、
第３図はワークの、サイジングダイへの嵌め込み状態を
示す拡大断面図、
第４図はワークを示す図、
第５図はサイジングダイへのワークの嵌め込み状態を示
す図、
第６図は加工用シートへのワークの着座状態を示す図で
ある。
Ｗ・・・ワーク ２・・・サイジングダ
イ１１・・・予備成形歯形 １２・・・金属石鹸
皮膜特許出願人 日産自動車株式会社
第２図
第３図
第４図
（ｂｔ
第５図
（ａ）
（ｂ）Fig. 1 is a process diagram showing an embodiment of the present invention, Fig. 2 is an enlarged cross-sectional view showing the uniform state of the metal soap film, Fig. 3 is an enlarged cross-sectional view showing the state of fitting the workpiece into the sizing die, FIG. 4 is a diagram showing the workpiece, FIG. 5 is a diagram showing the state in which the workpiece is fitted into the sizing die, and FIG. 6 is a diagram showing the state in which the workpiece is seated on the processing sheet. W... Workpiece 2... Sizing die 11... Preformed tooth profile 12... Metal soap film patent applicant Nissan Motor Co., Ltd. Figure 2 Figure 3 Figure 4 (bt Figure 5 (a) b)
Claims (1)
び金属石鹸皮膜を順次に形成するとともに、その金属石
鹸皮膜の、膜厚の均一化処理を施した後に、冷間サイジ
ングを行うことを特徴とする冷間サイジングの前処理方
法。1. A zinc phosphate film and a metal soap film are sequentially formed on the preformed workpiece, and the metal soap film is subjected to a treatment to make the film thickness uniform, and then cold sizing is performed. Pretreatment method for cold sizing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62309533A JP2701277B2 (en) | 1987-12-09 | 1987-12-09 | Work processing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62309533A JP2701277B2 (en) | 1987-12-09 | 1987-12-09 | Work processing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01152280A true JPH01152280A (en) | 1989-06-14 |
| JP2701277B2 JP2701277B2 (en) | 1998-01-21 |
Family
ID=17994161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62309533A Expired - Fee Related JP2701277B2 (en) | 1987-12-09 | 1987-12-09 | Work processing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2701277B2 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5311840A (en) * | 1976-07-21 | 1978-02-02 | Nippon Packaging Kk | Surface treatment of carbon steel and alloyed steel for cold working |
| JPS5311839A (en) * | 1976-07-21 | 1978-02-02 | Nippon Packaging Kk | Surface treatment of carbon steel and alloyed steel for cold working |
| JPS58213880A (en) * | 1982-06-04 | 1983-12-12 | Nippon Parkerizing Co Ltd | Lubricating treatment of steel material before cold working |
| JPS61217583A (en) * | 1985-03-22 | 1986-09-27 | Daido Steel Co Ltd | Phosphating method |
| JPS61269929A (en) * | 1985-05-24 | 1986-11-29 | Nippon Parkerizing Co Ltd | Lubricating treatment of metallic material |
-
1987
- 1987-12-09 JP JP62309533A patent/JP2701277B2/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5311840A (en) * | 1976-07-21 | 1978-02-02 | Nippon Packaging Kk | Surface treatment of carbon steel and alloyed steel for cold working |
| JPS5311839A (en) * | 1976-07-21 | 1978-02-02 | Nippon Packaging Kk | Surface treatment of carbon steel and alloyed steel for cold working |
| JPS58213880A (en) * | 1982-06-04 | 1983-12-12 | Nippon Parkerizing Co Ltd | Lubricating treatment of steel material before cold working |
| JPS61217583A (en) * | 1985-03-22 | 1986-09-27 | Daido Steel Co Ltd | Phosphating method |
| JPS61269929A (en) * | 1985-05-24 | 1986-11-29 | Nippon Parkerizing Co Ltd | Lubricating treatment of metallic material |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2701277B2 (en) | 1998-01-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |