WO2008026775A1 - Procédé permettant de polir une chaîne à maillons ayant une résistance à la fatigue supérieure à 230 n/mm2 - Google Patents

Procédé permettant de polir une chaîne à maillons ayant une résistance à la fatigue supérieure à 230 n/mm2 Download PDF

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Publication number
WO2008026775A1
WO2008026775A1 PCT/JP2007/067356 JP2007067356W WO2008026775A1 WO 2008026775 A1 WO2008026775 A1 WO 2008026775A1 JP 2007067356 W JP2007067356 W JP 2007067356W WO 2008026775 A1 WO2008026775 A1 WO 2008026775A1
Authority
WO
WIPO (PCT)
Prior art keywords
polishing
link chain
link
vibration
chain
Prior art date
Application number
PCT/JP2007/067356
Other languages
English (en)
Japanese (ja)
Inventor
Hiroshi Higuchi
Kenichi Kotani
Original Assignee
Kito Corporation
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 Kito Corporation filed Critical Kito Corporation
Publication of WO2008026775A1 publication Critical patent/WO2008026775A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21L—MAKING METAL CHAINS
    • B21L15/00—Finishing or dressing chains or chain links, e.g. removing burr material, calibrating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
    • B24B31/06—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor involving oscillating or vibrating containers

Definitions

  • the present invention relates to a method for polishing a link chain having a fatigue strength of 2 30 NZ mm 2 or more only by applying mechanical vibration.
  • Chain block U “Buck”, especially “Electric chain” High fatigue strength characteristics are required for the link chain used in the block. This is because when a load is lifted or hung at a high speed, the link chain undergoes load fluctuations, and this repeated action causes fatigue cracks from the site where the maximum main stress of the link chain occurs, eventually leading to failure. It is known. Conventionally, in the link chain manufacturing process, the stress concentration part that causes fatigue break-up, such as the minute misalignment of the mating surface of the upper and lower molds used in forming the link shape, gaps, etc. Occurrence of burrs with a maximum height of 200 m and streaks occurs on the link. These protrusions become a stress concentration source during use, and become the starting point of fracture.
  • barrel polishing is conventionally used as a method for mechanically removing the protrusions and burrs.
  • a polishing grindstone, a workpiece, and other necessary chemicals are inserted and sealed in a polishing tank, and the entire polishing tank is rotated at a constant speed by driving a separate motor. By stirring, the protrusions and burrs of the workpiece are removed (rotary barrel grinder).
  • the polishing tank is vibrated at a specific frequency, and a polishing grindstone, work piece, and others are required in the polishing tank.
  • a method of removing the protrusions and burrs of the work piece by inserting a chemical, vibrating the entire polishing tank by a separate vibration, and stirring the polishing tank (vibrating barrel polishing machine).
  • a commercially available vibration motor, or a method of generating vibration by rotating the counter weight via a coupling of the motor drive is used, and it is a commercial machine as a vibration barrel polishing machine. .
  • the present inventors tried to apply to the link chain using the conventional manufacturing method described above.
  • the chain length (chain) has little polishing effect on the inner side of the link that needs to be deburred and can withstand productivity.
  • the chain was humped and the polishing effect could not be improved by stirring in the polishing tank of the barrel polishing machine. This is because the chain is normally rotated in only one direction because the polishing tank is rotated in one direction, and the degree of freedom of each link chain is impaired by twisting the link chain. There is. Therefore, the conventional method has almost no polishing effect inside the link. Disclosure of the invention
  • the present invention provides a method for polishing a link chain that has a fatigue strength of 2 30 NZmm 2 or more only by applying mechanical vibration.
  • the present invention was made to solve the above problems. The summary is as follows.
  • the vibration applied by the vibration polishing machine has a vibration frequency of 10 to 40 Hz, an amplitude of 1 to 6 mm, and a fatigue strength of 2 30 NZmm 2 or more according to claim 3 A method for polishing a link chain.
  • the link chain placed on the polishing tank and subjected to vibration polishing is a long link chain having a plurality of folded portions on the polishing tank.
  • ZSO A method for polishing a link chain with a fatigue strength of NZmm 2 or more.
  • Polishing time of long link chain transported on polishing tank W is 1 to 4 hours, The method for polishing a link chain having a fatigue strength of 2 30 N / mm 2 or more according to (3).
  • Fig. 1 is a diagram showing the state of protrusions and burrs that occur at the boundary between the parallel part and the curved part of the unprocessed link.
  • Fig. 2 (a) is a diagram showing the polished surface of the raw link before heat treatment, (b) is a diagram showing the polished surface after heat treatment, and (c) is polished under optimum polishing conditions. It is a figure which shows the state of the protrusion in a case, and a burr
  • the mandrel consisting of an upper mold and a lower mold is overlapped to form a link, and then the end faces are welded to form. Due to the occurrence of minute misalignment and gaps in the mandrel mating surface during this molding process, as shown in Fig. 1, protrusions or burrs with a maximum height of 200 i ni are generated inside the link. If these protrusions and burrs are left as they are, they become stress concentration sources during use and become the starting point of fracture. It has been found that this protrusion position frequently occurs at the boundary between the parallel part and the curved part inside each link of the link chain.
  • the present inventors are able to reduce or eliminate the above-mentioned protrusions or burrs.
  • a link chain manufactured from a wire made of low carbon alloy steel before quenching / tempering treatment or after quenching / tempering treatment is used as a vibration polishing machine. Place it on the polishing table, vibrate the polishing tank in a stationary or conveying state, and further polish the surface by vibrating the link chain itself, so that the parallel and curved portions of the individual links in the link chain.
  • the polishing method according to the present invention uses only a vibration source used in a vibration type barrel polishing machine or a commercially available vibration motor, and directly connects the link chain placed on the polishing tank to the vibration source via the polishing tank. It is transmitted to and vibrated and polished.
  • the vibratory barrel polishing machine used in the present invention is provided with a polishing tank with an elastic body on the base so as not to damage the link through a spring panel. It is not necessary to use any abrasive in this polishing tank regardless of whether it is a grindstone, solid or liquid.
  • a vibration motor is directly attached to the lower part of this polishing tank, or a counter weight unit that is connected to or integrated with the polishing tank is provided, and a separate extension that extends in parallel with the base connected to the county way tuner unit is provided.
  • the motor's rotation is converted into vibration by the counterway tuner through the rotating shaft to vibrate the link chain placed in the polishing tank.
  • the link chain on the polishing tank with a short link chain.
  • a specific interval is provided in the longitudinal direction of the polishing tank so that the chain links do not overlap.
  • Conveying speed is adjusted so that the polishing time is 1 to 4 hours with a sheave from the inlet at one end to the outlet at the other end as a structure that has multiple parallel turning points with straight parallel partition walls
  • polishing is performed while continuously conveying.
  • the vibration applied to the conveyed link chain has a vibration frequency of 10 to 40 Hz and an amplitude of 1 to 6 mm.
  • the above transport speed and applied vibration frequency vary depending on the size and length of the link chain, but if the link size is about 3 mm to 13 mm in diameter, the polishing time: 1 to 4 hours, vibration It can be polished sufficiently at a frequency of 10 to 40 Hz and an amplitude of 1 to 6 mm. When the vibration frequency is 10 Hz or less and the amplitude is 1 mm or less, a poorly polished part occurs. Is unrealistic.
  • the transfer speed also depends on the length of the link chain, the size of the polishing tank, the amount of link chains arranged, and the transfer speed of the link chain, but it is about 0.02 to 3.3 m3 min. Degree is preferred.
  • FIG. 2 shows the observation results of the inner surface of each link of the link chain treated by the polishing method according to the present invention with an optical microscope (magnification X 2 0 0).
  • Figure 2 (a) shows the sharpening before heat treatment.
  • Fig. 2 (b) shows the observation results of the polished elementary links after heat treatment.
  • the chain manufacturing process adopts the polishing method according to the present invention as follows: 1) Before heat treatment (before quenching / tempering treatment), 2) After heat treatment (after quenching / tempering treatment), 3) Surface treatment (nothing After the electroplating, any of the following steps is effective in removing or reducing the protrusions, and it has been found that the fatigue strength is improved.
  • the fine protrusions and grooves on the inner side of the ring generated at the time of manufacturing the link chain are not limited by the length of the link chain, and only by applying mechanical vibration, it has high fatigue strength.
  • the link chain can be removed evenly and efficiently at a low cost, and a high-quality link chain can be provided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

La présente invention concerne un procédé permettant de polir une chaîne à maillons ayant une résistance à la fatigue supérieure à 230 N/mm2 par simple application d'une vibration mécanique. La présente invention concerne également une chaîne à maillons ayant une résistance à la fatigue supérieure à 230 N/mm2 caractérisée par un polissage de surface effectué de la manière suivante : une chaîne à maillons en acier allié à faible teneur en carbone avant recuit/revenu ou après recuit/revenu est placée dans une cuve de polissage dans une machine à polir par vibration, un polissage de surface est exécuté dans un état stationnaire ou de transfert par polissage par vibration pour amener la hauteur des protubérances et des bavures à la limite entre la partie parallèle et la partie incurvée dans les maillons individuels de la chaîne à maillons jusqu'à pas plus de 60 μm, de préférence pas plus de 30 μm. La présente invention concerne également un procédé de fabrication de la chaîne à maillons.
PCT/JP2007/067356 2006-09-01 2007-08-30 Procédé permettant de polir une chaîne à maillons ayant une résistance à la fatigue supérieure à 230 n/mm2 WO2008026775A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006237398A JP4841364B2 (ja) 2006-09-01 2006-09-01 ２３０Ｎ／ｍｍ２以上の疲労強度を有するリンクチェーンの研磨方法
JP2006-237398 2006-09-01

Publications (1)

Publication Number Publication Date
WO2008026775A1 true WO2008026775A1 (fr) 2008-03-06

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2007/067356 WO2008026775A1 (fr) 2006-09-01 2007-08-30 Procédé permettant de polir une chaîne à maillons ayant une résistance à la fatigue supérieure à 230 n/mm2

Country Status (2)

Country Link
JP (1) JP4841364B2 (fr)
WO (1) WO2008026775A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02218549A (ja) * 1989-02-20 1990-08-31 Tipton Mfg Corp 長尺連続体のバレル加工方法
JPH06126375A (ja) * 1992-09-07 1994-05-10 Kuroki Seisa Kk 鍛造スタッドリンクチェーン、その製造方法および装置
JP2003221621A (ja) * 2002-01-28 2003-08-08 Kinzoku Gijutsu Kenkyusho:Kk リンク体及びリンク体の熱処理方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02218549A (ja) * 1989-02-20 1990-08-31 Tipton Mfg Corp 長尺連続体のバレル加工方法
JPH06126375A (ja) * 1992-09-07 1994-05-10 Kuroki Seisa Kk 鍛造スタッドリンクチェーン、その製造方法および装置
JP2003221621A (ja) * 2002-01-28 2003-08-08 Kinzoku Gijutsu Kenkyusho:Kk リンク体及びリンク体の熱処理方法

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Publication number Publication date
JP4841364B2 (ja) 2011-12-21
JP2008057718A (ja) 2008-03-13

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