WO1999047288A1 - Matrice de filetage par roulage et procede de traitement de surface de ces matrices - Google Patents

Matrice de filetage par roulage et procede de traitement de surface de ces matrices Download PDF

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Publication number
WO1999047288A1
WO1999047288A1 PCT/JP1998/001137 JP9801137W WO9947288A1 WO 1999047288 A1 WO1999047288 A1 WO 1999047288A1 JP 9801137 W JP9801137 W JP 9801137W WO 9947288 A1 WO9947288 A1 WO 9947288A1
Authority
WO
WIPO (PCT)
Prior art keywords
hard coating
discharge
surface treatment
rolling die
rolling
Prior art date
Application number
PCT/JP1998/001137
Other languages
English (en)
Japanese (ja)
Inventor
Toshio Moro
Akihiro Goto
Original Assignee
Mitsubishi Denki Kabushiki Kaisha
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 Mitsubishi Denki Kabushiki Kaisha filed Critical Mitsubishi Denki Kabushiki Kaisha
Priority to PCT/JP1998/001137 priority Critical patent/WO1999047288A1/fr
Priority to PCT/JP1998/005105 priority patent/WO1999047290A1/fr
Publication of WO1999047288A1 publication Critical patent/WO1999047288A1/fr
Priority to US09/657,010 priority patent/US6314778B1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H3/00—Making helical bodies or bodies having parts of helical shape
    • B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/38—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for roll bodies

Definitions

  • the present invention relates to a rolling die and a surface treatment method of the rolling die, and more particularly, to a rolling die and a surface treatment method of a rolling die in which a hard coating is formed on a rolling blade surface by electric discharge surface treatment. Things. Background art
  • the rolling die material and the discharge electrode are opposed to each other with a predetermined discharge gap, and a discharge is generated between the rolling die material and the discharge electrode.
  • the reactant is deposited on the rolled cutting surface of the rolling die material, and the rolled cutting surface is formed of a hard film of a molten electrode consumable or a reactant thereof, for example, WC, Ti.
  • the formation of a hard coating made of a metal carbide such as C and T aC has already been proposed, and this is disclosed in Japanese Patent Laid-Open Publication No. 2-46940.
  • the surface treatment for forming a hard coating as described above is called a discharge surface treatment, and this kind of discharge surface treatment method is disclosed in Japanese Patent Application Laid-Open Publication No. Hei 6-18182,26, ⁇ 9- 1 9 8 2 9).
  • the hard coating obtained by the discharge surface treatment is a material that melts the electrode due to the discharge energy, and the reactant is deposited on the rolled blade surface of the rolling die material.
  • it shows higher hardness than the hard coating obtained by surface hardening treatment such as carburizing treatment, and the coating surface is in a state where discharge traces are accumulated, so the surface roughness is rougher than polished surface etc. It is known.
  • the surface roughness and hardness (abrasion resistance) required for rolling dies can be reduced by the discharge surface treatment surface without the need for roughening such as shot blasting and short shot machining by the discharge surface treatment alone.
  • the discharge surface treatment surface without the need for roughening such as shot blasting and short shot machining by the discharge surface treatment alone.
  • the material is It is also possible to omit the provision of a vertical groove at the beginning of filling the material of the rolling die with the fineness of the selection.
  • An object of the present invention is to provide a rolling die and a surface treatment method of the rolling die, which do not require frequent die replacement even in rolling. Disclosure of the invention
  • the present invention relates to a method for producing a discharge electrode, which is caused by discharge energy caused by electric discharge machining.
  • the hard coating is a primary hard coating made of a first material formed on a rolled blade surface, and the first hard coating formed on the primary hard coating. It is possible to provide a rolling die having a multilayer dissimilar material structure formed of a secondary hard coating made of a second material different from the material.
  • the hard coating that covers the rolled blade surface is multifunctional in terms of material with a primary hard coating made of a first material and a secondary hard coating made of a second material.
  • the wear resistance is better than that of a single-layer structure. It is further improved and has excellent durability.
  • the primary hard coating is a hard coating made of a hard metal carbide such as WC, TiC, TaC, and the secondary hard coating is a metal or a metal compound having self-lubricating properties.
  • a hard metal carbide such as WC, TiC, TaC
  • the secondary hard coating is a metal or a metal compound having self-lubricating properties.
  • M o, B, N, M 0 S 2 it is possible to provide a rolling die it is hard coating, and the like C.
  • WS 2 a hard coating made of a hard metal carbide
  • the rolling blade surface of the rolling die has a primary hard coating of high hardness made of a hard metal carbide such as WC, TiC, and TaC, and a metal or metal compound having self-lubricating properties or Mo, Mo, or the like.
  • B, N, M 0 S 2 , C, is by connexion coated hard coating of the multilayer different materials structure the secondary hard coating having self-lubricating property, including WS 2, Ri by even more structures, wear resistance Is further improved, resulting in excellent durability.
  • the present invention provides a method for forming a discharge between a rolling die material and a discharge electrode by facing the rolling die material and a discharge electrode in a machining fluid with a predetermined discharge gap therebetween.
  • the electrode consumable melt generated by the energy causes the reactant to adhere and deposit on the rolled cutting surface of the rolling die material, and the roll condensed molten material or a hard coating of the reactant on the rolled cutting surface.
  • a primary hard film of a first material is formed on a rolling blade surface using a discharge electrode for forming a hard film of a first material.
  • a secondary hard coating made of a second material is formed on the primary hard coating using a discharge electrode for forming a hard coating made of a second material different from the first material,
  • the cutting surface is made of a multi-layered Ru out to provide a surface treatment method of the rolling die coated by coating.
  • the hard coating covering the rolled blade surface is multifunctional in terms of material with the primary hard coating made of the first material and the secondary hard coating made of the second material, and these two types of materials are used.
  • the primary hard coating made of the first material and the secondary hard coating made of the second material are used.
  • the discharge surface treatment for forming the primary hard coating uses a discharge electrode of a material for forming a hard coating made of a hard metal carbide such as WC;
  • the discharge surface treatment for forming the secondary hard film forms a hard film containing a metal or a metal compound having self-lubricating properties, or Mo, B, N, Mo S 2 , C, WS 2 or the like. It is possible to provide a surface treatment method of a rolling die performed in a machining fluid containing oil as a main component using a discharge electrode made of a material.
  • WC, T i C. T a primary hard target film having a high hardness in hard metal carbide such as C, a metal or a metal compound having the self-lubricating property, or Mo, B, N, Mo S 2, C, WS 2
  • the rolled cutting surface is covered with a hard coating of a multi-layered dissimilar material structure consisting of a secondary hard coating having self-lubricating properties, such as a carbide with the oil of the working fluid, and abrasion resistance.
  • a rolling die with further improved properties is obtained.
  • the discharge surface treatment for forming the primary hard coating is performed using a discharge electrode of a material for forming a hard coating made of a hard metal carbide such as WC, TiC. discharge surface treatment for forming the hard coating, using metals or metal compounds having the self-lubricating property, or Mo, B, N, Mo S 2, the discharge electrodes of the material forming the hard coating, including C. WS 2 Surface treatment method for a rolling die performed in a working fluid containing water as a main component.
  • WC Ti C
  • a primary hard target film having a high hardness in hard metal carbide such as T a C, metal or metal compounds or Mo having a self-lubricating
  • WS 2 The rolled cutting surface is covered with a hard coating of a multi-layered dissimilar material structure with a secondary hard coating having self-lubricating properties, and a rolling die with a further improved abrasion resistance than that of a structure is provided. can get.
  • FIG. 1 is a schematic perspective view showing an electric discharge machining apparatus used for carrying out the surface treatment method of a rolling die according to the present invention
  • FIG. 2 is a surface view of the rolling die according to the present invention
  • FIG. 3 is a plan view showing one embodiment of a processing method
  • FIGS. 3 (a) and 3 (b) are enlarged cross-sectional views showing a main part of a rolling die according to the present invention.
  • FIG. 1 shows a discharge processing apparatus used for carrying out the surface treatment method for a rolling die according to the present invention.
  • This electric discharge machining device may be a general electric discharge machining device.
  • the discharge electrode 5 for the primary discharge surface treatment and the discharge electrode 5 for the secondary discharge surface treatment are mounted on the electrode support shaft 1 which is vertically moved by a shank 3. 2 is interchangeably mounted.
  • a rolling die material (flat die) W as a workpiece is arranged in the processing tank 7, a rolling die material (flat die) W as a workpiece is arranged.
  • the illustrated rolling die material W is a thread rolling die, and the rolling blade surface Wb has a number of ridges a with a triangular cross section, and an inclination angle 0 according to the screw lead angle 0 (see FIG. 2). ) Is attached.
  • the processing liquid in the processing liquid tank 9 is injected into the processing tank 7 by the pump 11.
  • a processing liquid is stored in the processing tank 7, and the rolling die material W is immersed in the processing liquid.
  • a voltage is applied between the discharge electrode 5 or 5 2 and the rolling die material W by a power supply 13 for electric discharge machining, and in the machining fluid, the electrode 5, 5 is vertically moved by moving the electrode support shaft 1 up and down.
  • Ayr between 5 2 and the rolling die material W, by discharge gap of about 1 0 C 1 0 ⁇ is given, in other words, the discharge electrode 5, Ayr 5 2 and rolling and the use die material W Ri by that opposite at a predetermined discharge Giyappu, rolling die material W and the discharge electrode 5, Isle pulsing electric discharge is generated between the 5 2.
  • a discharge electrode 5 for primary discharge surface treatment and a die material W for rolling are formed in the longitudinal direction of the ridge-shaped ridge a inclined at an inclination angle of 0. , And the rolling die material W and the discharge electrode 5! A discharge is generated between and.
  • the discharge energy generated by this discharge produces a molten electrode-consuming material containing reaction products, which adheres and accumulates on the rolled blade surface Wb of the rolling die material W, as shown in FIG. 3 (a).
  • the primary hard coating d of the first material determined by the material of the discharge electrode 5, for the primary discharge surface treatment is formed. It is formed.
  • the first material forming the primary hard coating d may be made of a hard metal carbide such as WC, Tic; and Tac.
  • Discharge electrode used in primary discharge surface treatment to form primary hard coating d 5! Is a powder of a hard metal such as Ti, a powder of a hard metal hydride such as Ti H 2 (titanium hydride), or a mixture of these with a powder of another metal or a powder of a ceramic material. Can be used.
  • titanium T i which is the main component of the electrode consumed by the discharge
  • carbon C which is a component in the machining fluid
  • the adhesion strength is extremely high, and it has been found that the acoustic signal has such a strength that an acoustic signal indicating the fracture cannot be detected in an acoustic scratch test or the like.
  • the surface of the coating was in a state where discharge traces were accumulated, and exhibited the same surface properties as when shot blasting was performed.
  • the surface roughness is rougher than the polished surface and the like, and has the same surface roughness as the shot blast surface.
  • a primary hard coating C having a required thickness is formed on the rolled blade surface Wb of the rolling die material W, and when the primary discharge surface treatment is completed, , longitudinally with respect to the secondary discharge surface discharge electrode 5 2 and the rolling die material W and the relative movement is allowed, such Although al for processing ridged projections a are inclined with a tilt angle of 0, the primary discharge similar to surface treatment, to generate a discharge electrostatic between the rolling die material W and the discharge electrode 5 2.
  • the discharge energy generated by this discharge generates molten materials for electrode consumption, including reaction products, which adhere and deposit on the primary hard coating d of the rolling die material W, as shown in Fig. 3 (b).
  • a secondary hard film C 2 of a second material determined by the material of the discharge electrode 52 for the secondary discharge surface treatment is formed on the primary hard film C.
  • the second material forming the second hard coating C 2 is a metal or metal compound having the self-lubricating property, or molybdenum M o, boron nitride BN, molybdenum disulfide M o S 2, graphite C, tungsten disulfide WS It may contain a single or a mixture of components such as 2 .
  • Discharge electrodes 5 2 used in secondary discharge surface treatment to form a secondary hard coating C 2 is the one used in the primary discharge surface treatment is another of the discharge electrode, the material is one lifting a self-lubricating metal body or metal compound, or molybdenum M o is other substance, nitride boron BN, molybdenum disulfide M o S 2, graphite (: compression molding a powder obtained by either alone or mixed with such disulfide tungsten emissions WS 2 A compacted electrode can be used.
  • the liquid used as the processing liquid is oil.
  • the secondary hard coating C 2 comprises a self-lubricating material carbide material Things. Material by secondary hard coating C 2 This is the hardness decreases as compared to that of a metal carbide such as T i C, to be imparted a lubricating function, rolling a large compressive load at the time of rolling is applied It has the effect of reducing the frictional resistance of the blade surface.
  • Secondary hard coating C 2 formed on the hard coating d of primary treatment is kicked set on very high coating hardness.
  • the compressive load in rolling is applied, occurs partial ⁇ , slide surface portion of the primary hard coating d is underlying Will be.
  • the functional film for secondary treatment (secondary hard coating C 2 ), which is caught between the material (rolled material) and the rolling die and falls off while separating, generates a lubricating effect and hardens the base material.
  • Coating Protecting the primary hard coating C and facilitating plastic deformation in the rolling of the material, reducing the rolling load and greatly reducing the rolling load acting on the rolling dies.
  • the hard coating of the treatment is protected for a long time and the hardness is high, so the base material of the rolled die is protected.
  • the hard coating formed by the discharge surface treatment has the characteristic of a functionally graded material in which the boundary layer between the base material and the coating changes continuously as a major feature of the discharge surface treatment.
  • the surface of the rolled die is subjected to a discharge surface treatment, a hard coating made of a TiC-based metal carbide is formed on the base, and a hard coating made of a carbide having a self-lubricating function is formed thereon.
  • Secondary discharge surface treatment for forming a secondary hard coating C 2 may also have use water as working fluid.
  • water machining fluid which is the main component gold Shokutai or metal compound of the discharge electrode, or molybdenum M o is other substance, boron nitride BN, molybdenum disulfide M o S 2, graph eye preparative C
  • no carbides are formed with the element of the simple substance or the mixture such as tungsten disulfide WS 2 and are confined to the die surface in the state of the electrode component.
  • the surface coating of the mixed material formed on the surface is not as hard as the carbide, but instead has the properties of the main component of the electrode base material. Since the components of the discharge electrode 5 2 for secondary discharge surface treatment has a self-lubricating, mother The mixture coating formed on the material surface also has self-lubricating properties.
  • the secondary hard coating C 2 formed on the primary hard coating d is provided on the extremely hard primary hard coating d, and the secondary hard coating C 2 is, as described above, Since the hardness is lower than that of the primary hard coating d, when a compressive load is applied in rolling, partial separation occurs, and the surface layer of the primary hard coating as a base material slides.
  • the functional film (secondary hard coating C 2 ) of the secondary treatment which is caught between the material (rolled object) and the rolling die and falls off while separating, generates a lubricating effect.
  • the underlying hard coating (primary hard coating C is protected and the plastic deformation in the rolling of the material is facilitated to reduce the rolling load, greatly reducing the rolling load acting on the rolling dies.
  • the hard coating of the primary treatment is protected for a long time, and the hardness is high, so that the base material of the rolled die is protected.
  • the hard coating formed by the discharge surface treatment is provided at the top because it has the characteristic of a functionally graded material in which the boundary layer between the base material and the coating changes continuously as a major feature of the discharge surface treatment.
  • a secondary hard coating C 2 the adhesion strength is very strong, over ⁇ and difficulty rather long in comparison with other methods, with features to hold the effect.
  • a double layer structure is formed rather than a single hard layer, and a hard layer made of TiC-based metal carbide is used as a base, and a metal body or a metal compound having a self-lubricating function, or molybdenum, which is another substance, is placed on the hard layer.
  • the surface of the rolled die is subjected to a discharge surface treatment, a TiC-based carbide hard coating is formed on the base, and a metal body or metal compound having a self-lubricating function is formed on top of it.
  • material in which molybdenum M o, boron nitride BN, two vulcanization molybdenum M o S 2, graphite (:, two to constitute the discharge surface treatment coating of a mixture of elemental or base material, such as tungsten disulfide WS 2 double structure
  • the rolling die according to the present invention is suitable for rolling of high-quality high-strength bolts and the like.

Abstract

Dans une matrice de filetage par roulage qui est un outil à rouler les filets et analogue, un film (C1) dur primaire ayant un haut de gré de dureté et comprenant une substance de fusion d'usure de l'électrode ou un produit de réaction de celle-ci est formé sur une face (Wb) marginale de roulage par le biais d'un traitement de surface primaire par décharge; un film (C2) dur secondaire obtenu par auto-lubrification par le biais d'un traitement de surface secondaire par décharge est également formé sur celle-ci. La face (Wb) marginale de roulage est ensuite recouverte des films durs de la structure multicouche des différents matériaux.
PCT/JP1998/001137 1998-03-18 1998-03-18 Matrice de filetage par roulage et procede de traitement de surface de ces matrices WO1999047288A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/JP1998/001137 WO1999047288A1 (fr) 1998-03-18 1998-03-18 Matrice de filetage par roulage et procede de traitement de surface de ces matrices
PCT/JP1998/005105 WO1999047290A1 (fr) 1998-03-18 1998-11-13 Matrice de profilage et procede de traitement de la surface d'une matrice de profilage
US09/657,010 US6314778B1 (en) 1998-03-18 2000-09-07 Rolling die and surface processing method for rolling die

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1998/001137 WO1999047288A1 (fr) 1998-03-18 1998-03-18 Matrice de filetage par roulage et procede de traitement de surface de ces matrices

Related Child Applications (1)

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PCT/JP1998/005105 Continuation WO1999047290A1 (fr) 1998-03-18 1998-11-13 Matrice de profilage et procede de traitement de la surface d'une matrice de profilage

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PCT/JP1998/001137 WO1999047288A1 (fr) 1998-03-18 1998-03-18 Matrice de filetage par roulage et procede de traitement de surface de ces matrices
PCT/JP1998/005105 WO1999047290A1 (fr) 1998-03-18 1998-11-13 Matrice de profilage et procede de traitement de la surface d'une matrice de profilage

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PCT/JP1998/005105 WO1999047290A1 (fr) 1998-03-18 1998-11-13 Matrice de profilage et procede de traitement de la surface d'une matrice de profilage

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4736479B2 (ja) * 2005-03-08 2011-07-27 株式会社Ｉｈｉ 表面処理方法
JP2007012740A (ja) * 2005-06-29 2007-01-18 Sumitomo Electric Ind Ltd 化合物半導体基板の加工方法
JP2007019099A (ja) * 2005-07-05 2007-01-25 Sumitomo Electric Ind Ltd 発光装置およびその製造方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0920975A (ja) * 1995-05-02 1997-01-21 Nippon Steel Corp 高密着性溶射ロール
JPH0978227A (ja) * 1995-09-19 1997-03-25 Toshiba Tungaloy Co Ltd 多層膜被覆部材
JPH09125230A (ja) * 1995-11-02 1997-05-13 Toshiba Tungaloy Co Ltd 高靭性被膜被覆体

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0246940A (ja) * 1988-08-08 1990-02-16 O S G Kk 転造加工工具
JPH055246U (ja) * 1991-07-05 1993-01-26 オーエスジー株式会社 転造ダイス
JP3525143B2 (ja) * 1995-03-23 2004-05-10 独立行政法人 科学技術振興機構 放電表面改質方法及びその装置
JP3537939B2 (ja) * 1996-01-17 2004-06-14 独立行政法人 科学技術振興機構 液中放電による表面処理方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0920975A (ja) * 1995-05-02 1997-01-21 Nippon Steel Corp 高密着性溶射ロール
JPH0978227A (ja) * 1995-09-19 1997-03-25 Toshiba Tungaloy Co Ltd 多層膜被覆部材
JPH09125230A (ja) * 1995-11-02 1997-05-13 Toshiba Tungaloy Co Ltd 高靭性被膜被覆体

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