CN111468889A - Manufacturing process of R6 grade kenter shackle - Google Patents
Manufacturing process of R6 grade kenter shackle Download PDFInfo
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- CN111468889A CN111468889A CN201911179515.1A CN201911179515A CN111468889A CN 111468889 A CN111468889 A CN 111468889A CN 201911179515 A CN201911179515 A CN 201911179515A CN 111468889 A CN111468889 A CN 111468889A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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Abstract
The utility model provides a manufacturing process of R6 grade kenter shackle, the change includes shackle body and horizontal pin, its characterized in that: the method comprises the following steps: 1) blanking; 2) making a blank of the D-shaped shackle body; 3) molding the D-shaped shackle body; 4) forming the shackle transverse pin; 5) polishing and finishing; the invention forges the forging with good mechanical property and meets the requirements of size and shape for the D-shaped shackle. The method is suitable for the processing field of riveting swivel of R6 mooring chain.
Description
Technical Field
The invention relates to the field of anchor chains for ships, in particular to a manufacturing process of an R6 grade Kent shackle
Background
The kenter shackle is a common chain connecting piece and has the advantages of simple structure and convenient disassembly. When the connecting device is used, the Kent shackle is characterized in that the two half rings are respectively connected with a section of chain ring, then the half rings are sleeved together, and the transverse pin and the taper pin are inserted. Because of the complex shape of the kenter shackle halves, the halves and the crosspiece need to be separately forged.
The R6 grade Kent shackle for mooring the ocean platform has the technical characteristics of ultrahigh strength and ultrahigh toughness, and simultaneously has certain fatigue resistance. The 89mmR6 grade kenter shackle requires the tensile strength of the material to exceed 1100MPa, the breaking load to exceed 1000 tons and the requirement on the structural strength is high. In order to ensure the toughness of the material, alloying elements must be added, thereby increasing hardenability and the risk of cracking. In addition, failure of any one ring in the mooring chain results in failure of the entire chain, while the kenter shackle is often the weakest ring, thus requiring the design of a special manufacturing process to ensure that the product meets performance requirements without defects.
Disclosure of Invention
The invention aims to provide a manufacturing process of an R6 grade kenter shackle, which solves the technical problems.
In order to achieve the technical purpose and achieve the technical requirements, the invention adopts the technical scheme that: a manufacturing process of an R6 grade kentucker shackle comprises the following steps:
1) discharging
Respectively selecting materials and blanking aiming at the Kent shackle semi-ring and the crosspiece, ensuring the smooth surface of a blanking piece and clearing saw cut edges and corners;
2) kent shackle semi-ring blank
Putting raw material round steel into a flame furnace and heating to 1200-1260 ℃; upsetting the heated round steel by using an air hammer and drawing the round steel to be long, wherein the total forging-pressing ratio is not less than 3:1, and the length of the bar stock is at least shortened 1/2 during upsetting. Then bending the blank to form a blank with a size close to that of the blank, wherein the blank is free from interlayer, cracking, grooves and other defects which reduce the product performance during forging;
3) kent shackle semi-ring formation
The forming die is inspected before forming, and the forming die cavity has a smooth surface without crack grooves and other defects for reducing the performance of products. Then heating the bent blank to 1200-1260 ℃, and carrying out forging forming by using a forming die, wherein the final forging temperature is not lower than 830 ℃;
4) kent shackle transom square billet
Putting the raw material round steel into a flame furnace for heating; upsetting and drawing the heated round steel into a square billet with approximate size by using an air hammer, wherein the billet has no defects of an interlayer, cracking, grooves and reduction of product performance during forging, and the final forging temperature is not lower than 830 ℃;
5) edging and polishing
And removing the flash of the formed blank by using an edge trimmer, and polishing by using a grinding wheel machine after removing the flash to obtain a smooth surface.
6) Thermal treatment
In order to ensure the uniformity of the strength and performance of the Kent shackle products, the forged blank is subjected to thermal refining.
7) Machining
In order to prevent the product from generating stress concentration in the using process to cause structural damage, all right-angle edges on the kenter shackle are required to be chamfered, and the radian is not less than 3% of the nominal diameter of the product.
As a preferred technical scheme: in the step 6), the specific process of thermal refining is as follows: normalizing (and/or annealing) + quenching + tempering, secondary treatment may be carried out if necessary. In order to ensure that the surface of the product is warm during processing, at least two additional thermocouples are attached to the surface of the workpiece. Unlike conventional heat treatments that begin with a furnace-to-temperature start, the R6 grade kenter break hold time is calculated with a surface thermocouple-to-temperature start. The normalizing temperature of the product is 820-920 ℃, the annealing temperature is 550-650 ℃, the quenching temperature is 880-980 ℃, and the tempering temperature is 570-650 ℃.
As a preferred technical scheme: and the radian of all right-angle edge chamfers on the kenter shackle is not less than 3 percent of the nominal diameter of the product.
As a preferred technical scheme: in order to further improve the fatigue resistance of the kenter shackle, the surface roughness of the convex part of the big end of the half ring of the kenter shackle is required to be not less than Ra3.2 mu m.
The manufacturing process provided by the invention can produce forgings with good mechanical properties, and meets the requirements of load and size. Meanwhile, due to the thermal sensitivity of the R6 grade material, a stepped heating method (namely heating at 600 ℃ for a period of isothermal time) is adopted during forging heating, so that the plasticity of the raw material is ensured and the hot cracking phenomenon of the raw material is prevented.
Detailed Description
The utility model provides a manufacturing process of R6 grade kenter shackle, the shackle includes shackle body and horizontal pin, its characterized in that: the method comprises the following steps: 1) blanking: ensuring the smooth surface of the blanking part and removing the edges and corners of the saw cut; 2) putting the raw material round steel into a flame furnace for heating; shaping and blanking the heated round steel by an electro-hydraulic hammer, rolling balls at two ends of the round steel through a special bow-shaped shackle ball head die, flattening and punching holes (the hole size is smaller than the forming size to ensure machining allowance), drawing out the middle section of the round steel to the required size of a forge piece through a special buckle die, and avoiding an interlayer, cracking, a groove and other defects of reducing the product performance during forging; 3) forming the shackle body: placing the blank on a special bending horse frame for bending, ensuring that a hammer is knocked in the center of the blank during bending, placing a special core mold at the inner gear position of a shackle after bending, knocking and shaping a hammer head, wherein the final forging temperature is not lower than 830 ℃, and no interlayer, cracking, groove or other defects which reduce the product performance exist during bending; 4) forming the shackle transverse pin: putting the raw material round steel into a flame furnace for heating; upsetting and drawing the heated round steel by using an air hammer, and then placing the round steel into a forming die for forming, wherein the round steel is free from interlayer, cracking, grooves and other defects for reducing the product performance during forging; 5) polishing and finishing: and removing the flash of the formed blank by using an edge trimmer, and polishing by using a grinding wheel machine after removing the flash to obtain a smooth surface.
Claims (4)
1. A process for manufacturing an R6 grade kenter shackle, a kenter shackle comprising two half rings, a ledge and a tapered pin;
the method is characterized in that: the specific production process manufacturing process comprises the following steps:
1) discharging
Respectively selecting materials and blanking aiming at the Kent shackle semi-ring and the crosspiece, ensuring the smooth surface of a blanking piece and clearing saw cut edges and corners;
2) kent shackle semi-ring blank
Putting raw material round steel into a flame furnace and heating to 1200-1260 ℃; upsetting and drawing out the heated round steel by using an air hammer, wherein the total forging-pressing ratio is not less than 3:1, and the length of the bar stock is at least shortened 1/2 during upsetting;
then bending the blank to form a blank with a size close to that of the blank, wherein the blank is free from interlayer, cracking, grooves and other defects which reduce the product performance during forging;
3) kent shackle semi-ring formation
The forming die is inspected before forming, and a forming die cavity has a smooth surface and no crack grooves or other defects for reducing the performance of products;
then heating the bent blank to 1200-1260 ℃, and carrying out forging forming by using a forming die, wherein the final forging temperature is not lower than 830 ℃;
4) kent shackle transom square billet
Putting the raw material round steel into a flame furnace for heating; upsetting and drawing the heated round steel into a square billet with approximate size by using an air hammer, wherein the billet has no defects of an interlayer, cracking, grooves and reduction of product performance during forging, and the final forging temperature is not lower than 830 ℃;
5) edging and polishing
Removing the flash of the formed blank by using an edge trimmer, and polishing the blank by using a grinding wheel machine after the flash is removed to obtain a smooth surface;
6) thermal treatment
In order to ensure the uniformity of the strength and performance of the Kent shackle product, quenching and tempering are carried out on a forged blank;
7) machining
In order to prevent the product from generating stress concentration in the using process to cause structural damage, all right-angle edges on the kenter shackle are required to be chamfered, and the radian is not less than 3% of the nominal diameter of the product.
2. The manufacturing process of an R6-grade kentucker shackle as claimed in claim 1, wherein: in the step 6), the specific process of thermal refining is as follows: normalizing (and/or annealing), quenching and tempering, and if necessary, carrying out secondary treatment;
in the treatment process, at least two additional thermocouples are additionally arranged on the surface of the workpiece to ensure that the surface of the product is at the temperature;
different from the traditional heat treatment in which the timing is started from the furnace hearth to the temperature, the heat preservation time of the R6 grade Kent shackle is calculated from the surface thermocouple to the temperature;
the normalizing temperature of the product is 820-920 ℃, the annealing temperature is 550-650 ℃, the quenching temperature is 880-980 ℃, and the tempering temperature is 570-650 ℃.
3. The manufacturing process of an R6-grade kentucker shackle as claimed in claim 1, wherein: and the radian of all right-angle edge chamfers on the kenter shackle is not less than 3 percent of the nominal diameter of the product.
4. The manufacturing process of an R6-grade kentucker shackle as claimed in claim 1, wherein: in order to further improve the fatigue resistance of the kenter shackle, the surface roughness of the convex part of the big end of the half ring of the kenter shackle is required to be not less than Ra3.2 mu m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911179515.1A CN111468889A (en) | 2019-11-27 | 2019-11-27 | Manufacturing process of R6 grade kenter shackle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911179515.1A CN111468889A (en) | 2019-11-27 | 2019-11-27 | Manufacturing process of R6 grade kenter shackle |
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| Publication Number | Publication Date |
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| CN111468889A true CN111468889A (en) | 2020-07-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911179515.1A Pending CN111468889A (en) | 2019-11-27 | 2019-11-27 | Manufacturing process of R6 grade kenter shackle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112606950A (en) * | 2020-12-08 | 2021-04-06 | 江苏亚星锚链股份有限公司 | Non-circular section chain ring and manufacturing method thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101303063A (en) * | 2008-06-27 | 2008-11-12 | 褚德华 | Double-lock head sawtooth pattern kent type unloading buckle |
| CN102069349A (en) * | 2010-12-01 | 2011-05-25 | 褚德华 | Machining method of Kenter shackle transom |
| CN202429328U (en) * | 2011-12-03 | 2012-09-12 | 靖江正茂锚链附件有限公司 | Kenter anchor shackle |
| CN102688965A (en) * | 2011-03-21 | 2012-09-26 | 江苏亚星锚链股份有限公司 | Forging method for kenter link as n accessory of an R5 grade mooring chain |
| CN103359258A (en) * | 2013-06-28 | 2013-10-23 | 江苏亚星锚链股份有限公司 | Kent pear-shaped shackle |
| CN103357811A (en) * | 2013-06-28 | 2013-10-23 | 江苏亚星锚链股份有限公司 | Method for forging Kent pear-shaped shackle |
| CN103567720A (en) * | 2013-10-10 | 2014-02-12 | 江苏亚星锚链股份有限公司 | Forging method for Kent shackle |
| CN105880950A (en) * | 2016-05-30 | 2016-08-24 | 江苏亚星锚链股份有限公司 | Manufacturing method for double-nut D type connecting shackle |
-
2019
- 2019-11-27 CN CN201911179515.1A patent/CN111468889A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101303063A (en) * | 2008-06-27 | 2008-11-12 | 褚德华 | Double-lock head sawtooth pattern kent type unloading buckle |
| CN102069349A (en) * | 2010-12-01 | 2011-05-25 | 褚德华 | Machining method of Kenter shackle transom |
| CN102688965A (en) * | 2011-03-21 | 2012-09-26 | 江苏亚星锚链股份有限公司 | Forging method for kenter link as n accessory of an R5 grade mooring chain |
| CN202429328U (en) * | 2011-12-03 | 2012-09-12 | 靖江正茂锚链附件有限公司 | Kenter anchor shackle |
| CN103359258A (en) * | 2013-06-28 | 2013-10-23 | 江苏亚星锚链股份有限公司 | Kent pear-shaped shackle |
| CN103357811A (en) * | 2013-06-28 | 2013-10-23 | 江苏亚星锚链股份有限公司 | Method for forging Kent pear-shaped shackle |
| CN103567720A (en) * | 2013-10-10 | 2014-02-12 | 江苏亚星锚链股份有限公司 | Forging method for Kent shackle |
| CN105880950A (en) * | 2016-05-30 | 2016-08-24 | 江苏亚星锚链股份有限公司 | Manufacturing method for double-nut D type connecting shackle |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112606950A (en) * | 2020-12-08 | 2021-04-06 | 江苏亚星锚链股份有限公司 | Non-circular section chain ring and manufacturing method thereof |
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Application publication date: 20200731 |
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