EP0684095B1 - Stanzwerkzeug - Google Patents

Stanzwerkzeug Download PDF

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Publication number
EP0684095B1
EP0684095B1 EP19950401227 EP95401227A EP0684095B1 EP 0684095 B1 EP0684095 B1 EP 0684095B1 EP 19950401227 EP19950401227 EP 19950401227 EP 95401227 A EP95401227 A EP 95401227A EP 0684095 B1 EP0684095 B1 EP 0684095B1
Authority
EP
European Patent Office
Prior art keywords
punch
elastic member
gas
gas cylinder
spring section
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.)
Expired - Lifetime
Application number
EP19950401227
Other languages
English (en)
French (fr)
Other versions
EP0684095A1 (de
Inventor
Oriya Fujita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Amada Metrecs Co Ltd
Original Assignee
Amada Metrecs Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Amada Metrecs Co Ltd filed Critical Amada Metrecs Co Ltd
Publication of EP0684095A1 publication Critical patent/EP0684095A1/de
Application granted granted Critical
Publication of EP0684095B1 publication Critical patent/EP0684095B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D45/00—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass
    • B21D45/003—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass in punching machines or punching tools
    • B21D45/006—Stripping-off devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
    • B21D28/20—Applications of drives for reducing noise or wear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/0076—Noise or vibration isolation means

Definitions

  • the present invention relates to a punching tool, and more specifically to a punching tool for a press, which can reduce noise generated during punching processing and further which can prevent a mark (scar) being formed on a surface of work due to punching pressure.
  • the punching tool is usually provided with a strong spring (referred to as a stripper spring, usually) for extracting the punch from the work.
  • a strong spring referred to as a stripper spring, usually
  • a compression spring such as a coil spring, a coned disk spring or urethane spring, etc. are used.
  • a coned disk spring is often used, because a large elastic force can be obtained at a small stroke.
  • a punching die comprising a punch body; a punch head provided for an upper portion of said punch body, said punch head struck by a striker; a punch guide disposed at a lower portion of said punch body; a retainer collar disposed over said punch guide and fitted to said punch body; a stripping spring interposed between said punch head and said retainer collar; and an elastically deformable damping member being interposed between an upper surface of said punch guide and a lower surface of said retainer collar.
  • EP-A-622 135 was published after the priority date of the present application and concerns a punching die comprising a punch body; a punch guide fitted on said punch body movably up and down with respect to said punch body; a punch head provided on a top portion of said punch body; a gaseous spring provided between said punch body and said punch guide for pushing said punch guide downwardly with respect to said punch body.
  • US-A-4 316 399 discloses a punch tool for a press, having a punch guide; a punch body formed with a blade portion at a lower end thereof and disposed within the punch guide movably up and down; a punch driver; and a gas spring section having a gas cylinder, a high pressure gas being filled in the gas cylinder, the gas spring section being interposed between the punch guide and the punch driver.
  • the punch driver (37) has a piston-like flange portion (39) connected to a piston rod portion (43) passing through the gas cylinder (45), the piston rod (43) of the punch driver (37) is fixed to said punch body (25); the high pressure gas filled in the gas cylinder acts on the piston-like flange portion (39) of the punch driver (37) so as to urge the punch body (25) and the punch driver (37) upwardly; and an elastic member (61) is interposed between an upper surface of said punch guide (19) and a lower surface of the gas cylinder (45) of said gas spring section (15) to absorb shock generated when work (W) is punched out by the punching tool.
  • the punching tool further comprises an elastic member holder (57) attached to the lower surface of the gas cylinder (45) of said gas spring section (15), for accommodating said elastic member (61), a deformation space (C) of said elastic member (61) being formed between a lower end surface of said elastic member holder (57) and the upper surface of said punch guide (19).
  • an elastic member holder (57) attached to the lower surface of the gas cylinder (45) of said gas spring section (15), for accommodating said elastic member (61), a deformation space (C) of said elastic member (61) being formed between a lower end surface of said elastic member holder (57) and the upper surface of said punch guide (19).
  • a mounting load of said elastic member (61) may be determined to be sufficiently smaller than that of said gas spring section (15) to such an extent as to be negligible; and a spring constant of said elastic member is so determined that an elastic force of said elastic member becomes roughly equal to a mounting load of said gas spring section (15) after having been deformed by the deformation space C.
  • said elastic member holder may be a reverse U-shaped cross section annular elastic member holder.
  • an outer diameter of the gas cylinder (45) of said gas spring section (15) is determined to be roughly equal to an outer diameter of said punch guide (19).
  • the piston rod of said punch driver (37) may be formed with a large diameter portion (41) projecting upward from an upper surface of the gas cylinder (45) of said gas spring section (15) and with a small diameter portion (43) projecting downward from a lower surface of the gas cylinder (45) thereof, a punch head (77) being attached to an upper surface of the large diameter portion (41), and said punch body (25) being fixed to a lower surface of the small diameter portion (43) via a punch key holder (55).
  • the elastic member shock absorber
  • the elastic member is interposed between the upper surface of the punch guide and the lower surface of the gas cylinder of the gas spring section, it is possible to absorb shock generated when work is punched out and further to prevent a mark (a scar) from being formed on the surface of the punched work.
  • a mounting load of the elastic member is determined to be sufficiently smaller than that of the gas spring section to such an extent as to be negligible and further when a spring constant of the elastic member is so determined that an elastic force of the elastic member becomes roughly equal to a mounting load of the gas spring section after having been deformed by the deformation space C, it is possible to effectively absorb shock generated when the mounting load of the gas spring section is applied from the stripper plate to the work, without reducing much the mounting load of the gas spring section.
  • the outer diameter of the gas cylinder of the gas spring section is determined to be roughly equal to an outer diameter of the punch guide, it is possible to construct the punching tool compactly.
  • the piston rod of said punch driver is formed with a large diameter portion projecting upward from an upper surface of the gas cylinder of the gas spring section and with a small diameter portion projecting downward from a lower surface of the gas cylinder thereof, whenever the punch driver is struck by the striker to push the large diameter portion piston rod into the gas cylinder, the gas pressure within the gas cylinder is increased, so that the upward urging force applied to the large diameter portion piston rod increases, with the result that it is possible to more securely strip the blade portion of the punch body from the punched work.
  • an upper tool (punching tool) 9 is fitted to an upper tool supporting hole 5 of an upper turret 1 of a turret punch press (one sort of punch press machines) (not shown), and a lower tool (die) 11 is also fitted to a lower die supporting hole 7 of a lower turret 3 of the same turret punch press.
  • the punching tool (the upper tool) 9 comprises a punch section 13 composed of a punch guide 19, a punch body 25, a punch driver 37; a gas spring section 15 composed of a gas cylinder 45 and a cylinder end 51, and a shock absorber 17 composed of an annular elastic member holder 57 and an annular elastic member 61.
  • the cylindrical punch guide 19 is formed with a pair of inner flange 21A and an outer flange 21B on the upper end portion thereof. Further, on the lower end of the same cylindrical punch guide 19, a stripper plate 33 is attached by use of a plurality of bolts. The stripper plate 33 is formed with an engage hole 35 into which a punch blade 27 is fitted (described below).
  • a punch body 25 is fitted into the punch guide 19 so as to be movable un and down.
  • the punch body 25 is formed with a blade portion 27 of an appropriate shape at the lower end surface thereof and with a mounting threaded hole 31 at the upper end surface thereof.
  • the blade portion 27 is engaged with the engage hole 35 formed in the stripper plate 33 in such a way as to provide an appropriate similar-figure clearance between the blade portion 27 of the punch body 25 and the engage hole 35 of the stripper plate 33.
  • the punch driver 37 is fixed to the punch body 25 with a fastening bolt 73 inserted into a central axial hole 71 formed in the punch driver 37 via a punch key holder 55.
  • the counter bored hole 71 is formed at an axial portion of the punch driver 37, and the fastening bolt 73 is previously inserted into the hole 71 to fix the punch body 37 to the punch body 25.
  • the punch driver 37 serves as a piston rod movable up and down in the gas cylinder 45 and the cylinder end 51.
  • the punch driver 37 is formed with a large diameter piston rod portion 41 on a flange portion 39 thereof and a small diameter piston rod portion 43 below the flange portion 39.
  • the large diameter portion 41 of the punch driver 37 is supported so as to be movable up and down by an upper end guide portion 47A of the gas cylinder 45, and the small diameter portion 43 of the punch driver 37 is also supported so as to be movable up and down by a lower end guide portion 47B of the cylinder end 51 of the gas cylinder 45.
  • the cylinder end 51 is fixed to the gas cylinder 45 by use of an appropriate fixing means.
  • a sealing member 49C is interposed between an outer surface of the cylinder end 51 provided on the lower side of the gas cylinder 45 and an inner surface of the gas cylinder 45, to seal the inside of the gas cylinder 45 airtightly. Further, another sealing member 49A is interposed between the upper guide portions 47A of the gas cylinder 45 and the large diameter piston rod 41 of the punch driver 37, and still another sealing member 49B is interposed between the lower guide portions 47B of the cylinder end 51 of the gas cylinder 45 and the small diameter piston rod 43 of the punch driver 37, both to seal the inside of the gas cylinder 45 airtightly.
  • an inner space 53 of the gas cylinder 45 and the cylinder end 51 is filled with an appropriate gas (e.g., air, nitrogen, etc.) under an appropriate pressure so as to generate an appropriate elastic force as a gas spring.
  • the inner space 53 is filled with nitrogen gas and pressurized under about 150 kg/cm 2 .
  • a punch head member 77 (a struck portion) formed with a central threaded hole 75 is mounted.
  • the small diameter piston rod portion 43 of the punch driver 37 projects downward from the lower guide portion 47B of the cylinder end 51 of the gas cylinder 45 so as to extend to the lower end surface of the inner flange 21A of the punch guide 19.
  • a disk-shaped punch key holder 55 having a diameter slightly smaller than that of the punch body 25 is attached.
  • the outer diameter of the gas cylinder 45 is roughly the same as that of the punch guide 19.
  • the outer diameter of the guide portion 47B of the cylinder end 51 disposed at the lower end portion of the gas cylinder 45 is smaller than that of the gas cylinder 45, and projects slightly downward from the lower surface of the gas cylinder 45. Further, the lower end portion of the guide portion 47B of the cylinder end 51 is fitted to an upper inner diameter of the punch guide 19 so as to be movable up and down.
  • the feature of the punching tool according to the present invention is to provide the shock absorber 17 between the punch guide 19 and the cylinder end 51 or the gas cylinder 45, to absorb shock (determined by a high mounting load of the gas spring section 15) generated when the stripper plate 33 collides against the work W.
  • an annular elastic member holder 57 having a reverse U-shaped cross section is fitted to the outer circumferential surface of the downward-projecting guide portion 47B of the cylinder end 51.
  • the annular elastic member 61 e.g., a hard rubber having an appropriate hardness
  • This annular elastic member 61 is mounted under a constant mounting pressure (compression load) between the upper surface of the outer flange 21B of the punch guide 19 and the annular elastic member holder 57.
  • the cylinder end 51 is urged upward and the punch guide 19 is urged downward by an elastic force of the annular elastic member 61.
  • the punch driver 37 is urged upward via a high pressure gas filled in the inside of the gas cylinder 45, and further the inner flange 21A of the punch guide 19 is to be clamped between the punch key holder 55 and the annular elastic member 61.
  • the punch guide 19 is formed with a punch guide groove 67 engaged with both a punch guide key 63 fixed to the upper turret 1 and a punch key 65 fixed to the punch key holder 55.
  • the punch body 25 is formed with a punch key groove 69 engaged with the punch key 65.
  • the punch key groove 69 of the punch body 25 is engaged with the punch key 65 fixed to the punch key holder 55, and the punch body 25 is fixed to the punch key holer 55 by fastening the bolt 73 inserted into the central bore 75 of the punch driver 37.
  • a lower tool (die) 11 is fixed to a lower turret 3 after the angular position of the die 11 has been decided by use of a key groove and a die key (both not shown).
  • the structure of the die 11 is not described in detail herein, because the die 11 is not directly related to the gist of the present invention.
  • the punching tool 9 is fitted to an upper punch supporting hole 5 formed in the upper turret 1.
  • the lower tool (die) 11 mated with the punching tool 9 is fitted to the lower tool supporting hole 7 formed in the lower turret 3.
  • the punching tool is set for work punching processing. After that, work W is interposed between the punch 9 and the die 11 in position. When the punch head 77 is struck by a striker 81, the work W can be punched out.
  • the upper limit position of the punch 9 is determined at a constant height by a lifter spring mechanism 79 disposed in an upper die support hole 5 formed in the turret punch press, so as to be movable up and down relative to the die 11.
  • Fig. 2 shows the variation in load applied to the stripper plate 33 from when the stripper plate 33 is brought into contact with the work W and to when blade portion 27 of the punch body 25 is brought into contact with the work W for the punching processing by the above-mentioned punching tool, in which the curve A denotes the case where the shock absorber 17 (i.e., the annular elastic member 61) according to the present invention is disposed and the curve B denotes the case where only the gas spring section 15 is disposed without disposing the shock absorber 17.
  • the curve A denotes the case where the shock absorber 17 (i.e., the annular elastic member 61) according to the present invention is disposed
  • the curve B denotes the case where only the gas spring section 15 is disposed without disposing the shock absorber 17.
  • Fig. 2 indicates that in the case of the curve B, the mounting load (about several thousand kg) of the gas spring section 15 is directly applied from the stripper plate 33 to the work W as an impact.
  • the noise generated when the stripper plate 33 collides against the work W is large, and thereby a punch mark (scar) is inevitably formed on the surface of the work W by the stripper plate 33.
  • Fig. 2 indicates the mounting load of the gas spring section 15 applied from the stripper plate 33 to the work W can be fairly reduced due to the presence of the shock absorber 17 (i.e., the annular elastic member 61).
  • the mounting load of the shock absorber 17 is determined to be sufficiently smaller than that of the gas spring section 15 to such an extent as to be negligible (the difference in load between the two curves A and B is small, as shown in Fig. 2).
  • the spring constant of the shock absorber 17 is so selected as to become roughly equal to the mounting load of the gas spring section 15 after having been deformed by the deformation space C, as shown in Fig. 2.
  • the punching tool according to the present invention it is possible to reduce the noise generated at collision of the stripper plate 33 against the work W and further to increase the lifetime of the shock absorber 17 (the annular elastic member 61), thus preventing a punch mark (scar) from being formed on the surface of the work W.
  • the punch body 25 is fixed to the punch driver 37 by fastening the bolt 73 disposed inside of the punch driver 37
  • a rotational force generated when both the members 25 and 37 are fixed to each other is not directly applied to the keys and the key groove, there exists such an effect that the keys 63 and 65 can be kept engaged with the key grooves 67 at high precision.
  • the annular elastic member shock absorber
  • the annular elastic member is interposed between the upper surface of the punch guide and the lower surface of the gas cylinder of the gas spring section, it is possible to absorb shock generated when work is punched out and further to prevent a mark (a scar) from being formed on the surface of the punched work.
  • the reverse U-shaped cross section annular elastic member holder is attached to the lower surface of the gas cylinder to accommodate the annular elastic member (shock absorber) and further a deformation space C of the annular elastic member is formed between the lower end surface of the annular elastic member holder and the upper surface of the punch guide, it is possible to restrict the deformation rate of the annular elastic member within this deformation space C, so that the lifetime of the annular elastic member can be increased.
  • a mounting load of the annular elastic member is determined to be sufficiently smaller than that of the gas spring section to such an extent as to be negligible and further since a spring constant of the annular elastic member is so determined that an elastic force of the annular elastic member becomes roughly equal to a mounting load of the gas spring section after having been deformed by the deformation space C, it is possible to effectively absorb shock generated when the mounting load of the gas spring section is applied from the stripper plate to the work, without reducing much the mounting load of the gas spring section.
  • the outer diameter of the gas cylinder of the gas spring section is determined to be roughly equal to an outer diameter of the punch guide, it is possible to construct the punching tool compactly.
  • the piston rod of said punch driver is formed with a large diameter portion projecting upward from an upper surface of the gas cylinder of the gas spring section and with a small diameter portion projecting downward from a lower surface of the gas cylinder thereof, whenever the punch driver is struck by the striker to push the large diameter portion piston rod into the gas cylinder, the gas pressure within the gas cylinder is increased, so that the upward urging force applied to the large diameter portion piston rod increases, with the result that it is possible to more securely strip the blade portion of the punch body from the punched work.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Punching Or Piercing (AREA)

Claims (6)

  1. Stanzwerkzeug für eine Presse, das aufweist:
    eine Stanzführung (19);
    einen Stanzkörper (25), der mit einem Schneidenabschnitt (27) an einem unteren Ende desselben versehen ist und in der Stanzführung nach oben und nach unten beweglich angeordnet ist;
    einen Stanzmitnehmer (37); und
    einen Gasfederabschnitt (15) mit einem Gaszylinder (45), wobei ein Hochdruckgas in den Gaszylinder gefüllt ist und der Gasfederabschnitt (15) zwischen die Stanzführung (19) und den Stanzmitnehmer (37) eingesetzt ist,
    dadurch gekennzeichnet, daß:
    der Stanzmitnehmer (37) einen kolbenartigen Flanschabschnitt (39) hat, der an einem Kolbenstangenabschnitt (34) angebracht ist, der durch den Gaszylinder hindurchtritt,
    dadurch, daß der Kolbenstangenabschnitt (43) des Stanzmitnehmers (37) an dem Stanzkörper befestigt ist;
    dadurch, daß das Hochdruckgas, das in den Gaszylinder gefüllt ist, so auf den kolbenartigen Flanschabschnitt (39) des Stanzmitnehmers (37) wirkt, daß der Stanzkörper (25) und der Stanzmitnehmer (37) nach oben gedrückt werden; und
    dadurch, daß sich ein elastisches Element (61) zwischen einer oberen Fläche der Stanzführung (19) und einer unteren Fläche des Gaszylinders (45) des Gasfederabschnitts (15) befindet und Stoß dämpft, der erzeugt wird, wenn ein Arbeitsstück (W) mit dem Stanzwerkzeug ausgestanzt wird.
  2. Stanzwerkzeug nach Anspruch 1, wobei eine Aufnahme (57) für das elastische Element des weiteren an der unteren Fläche des Gaszylinders (45) des Gasfederabschnitts (15) angebracht ist und das elastische Element (61) aufnimmt, wobei ein Verformungsraum (C) des elastischen Elementes (61) zwischen einer unteren Abschlußfläche der Aufnahme (57) für das elastische Element und der oberen Fläche der Stanzführung (19) ausgebildet ist.
  3. Stanzwerkzeug nach Anspruch 2, wobei eine Anbringungslast des elastischen Elementes (61) so festgelegt wird, daß sie um ein Maß geringer ist als die des Gasfederabschnitts (15), aufgrund dessen sie vernachlässigt werden kann; und eine Federkonstante des elastischen Elementes so festgelegt wird, daß eine Federkratt des elastischen Elementes ungefähr einer Anbringungslast des Gasfederabschnitts (15) gleicht, nachdem es durch den Verformungsraum C verformt worden ist.
  4. Stanzwerkzeug nach Anspruch 2, wobei die Aufnahme (57) für das elastische Element eine ringförmige Aufnahme für das elastische Element mit einem umgekehrt U-förmigen Querschnitt ist.
  5. Stanzwerkzeug nach Anspruch 1, wobei die Kolbenstange des Stanzmitnehmers (37) mit einem Abschnitt (41) mit großem Durchmesser versehen ist, der von einer oberen Fläche des Gaszylinders (45) des Gasfederabschnitts (15) nach oben vorsteht, und mit einem Abschnitt (43) mit keinem Durchmesser, der von einer unteren Fläche des Gaszylinders (45) desselben nach unten vorsteht, wobei ein Stanzkopf (77) an einer oberen Fläche des Abschnitts (41) mit großem Durchmesser angebracht ist, und der Stanzkörper (25) über einen Stanzkeilhalter (55) an einer unteren Fläche des Abschnitts (43) mit kleinem Durchmesser befestigt ist.
  6. Stanzwerkzeug nach Anspruch 1, wobei ein Außendurchmesser des Gaszylinders (45) des Gasfederabschnitts (15) so festgelegt wird, daß er ungefähr einem Außendurchmesser der Stanzführung (19) gleicht.
EP19950401227 1994-05-27 1995-05-24 Stanzwerkzeug Expired - Lifetime EP0684095B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP115083/94 1994-05-27
JP11508394 1994-05-27

Publications (2)

Publication Number Publication Date
EP0684095A1 EP0684095A1 (de) 1995-11-29
EP0684095B1 true EP0684095B1 (de) 1998-08-12

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Application Number Title Priority Date Filing Date
EP19950401227 Expired - Lifetime EP0684095B1 (de) 1994-05-27 1995-05-24 Stanzwerkzeug

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EP (1) EP0684095B1 (de)
DE (1) DE69503967T2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101700551B (zh) * 2009-10-21 2011-08-31 吴江市双精轴承有限公司 止动环冲模

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19827850A1 (de) * 1998-06-23 1999-12-30 Mate Precision Tooling Gmbh Werkzeughalter mit Stanzstempeleinheiten
CN101698214B (zh) * 2009-10-28 2012-05-23 吴江市双精轴承有限公司 定珠圈冲径模
CN104307972A (zh) * 2014-08-26 2015-01-28 四川金锋建设有限公司 混凝土钢模板打孔机冲压时的缓冲装置
CN104890046B (zh) * 2015-06-27 2017-01-11 江苏金铁人自动化科技有限公司 一种电线穿线槽打孔机构
CN104889231B (zh) * 2015-06-27 2017-03-01 江苏金铁人自动化科技有限公司 一种电线穿线槽打孔用打孔装置
CN108453170A (zh) * 2018-05-30 2018-08-28 重庆伟福机械有限公司 具有打磨功能的冲压装置
CN111570635A (zh) * 2020-06-02 2020-08-25 朱健斌 一种可以自动给冲压腔外壁降温的冲压装置

Family Cites Families (4)

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Publication number Priority date Publication date Assignee Title
US4316399A (en) * 1980-04-04 1982-02-23 Wallis Bernard J Combined punch retainer and fluid actuated stripper
US5131303A (en) * 1991-08-12 1992-07-21 Wilson Tool International Punch assembly
JP2636128B2 (ja) * 1993-02-03 1997-07-30 株式会社アマダメトレックス パンチング金型
JP2610768B2 (ja) * 1993-03-31 1997-05-14 株式会社アマダメトレックス パンチング金型

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101700551B (zh) * 2009-10-21 2011-08-31 吴江市双精轴承有限公司 止动环冲模

Also Published As

Publication number Publication date
DE69503967D1 (de) 1998-09-17
DE69503967T2 (de) 1999-01-28
EP0684095A1 (de) 1995-11-29

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