CN104002098A - Processing technic of deformed steel wire special for automobile piston ring - Google Patents
Processing technic of deformed steel wire special for automobile piston ring Download PDFInfo
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- CN104002098A CN104002098A CN201410088056.7A CN201410088056A CN104002098A CN 104002098 A CN104002098 A CN 104002098A CN 201410088056 A CN201410088056 A CN 201410088056A CN 104002098 A CN104002098 A CN 104002098A
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- steel wire
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- automobile piston
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Metal Rolling (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a processing technic of a deformed steel wire special for an automobile piston ring. The processing technic comprises the steps of feeding, first cold rolling, bright annealing, second cold rolling, rolling drawing, mold drawing, punching, bright quenching and tempering, and coiling. According to the processing technic of the deformed steel wire special for the automobile piston ring, the steel wire is machined to a shape required by the automobile piston ring through the first cold rolling and the second cold rolling, final machining of the automobile piston ring is finished through roller drawing and mold drawing, metal gloss of the surface of the automobile piston ring is protected through bright annealing, and the mechanical performance of an automobile piston ring product is enhanced through bright quenching and tempering. A casting process is not used in the steps, thereby preventing air bubbles occurring inside the automobile piston ring due to casting. Cold rolling is taken as a main process, thereby lowering the energy consumption in the process and preventing environmental pollution.
Description
Technical field
The present invention relates to a kind of auto parts and components production technology, relate in particular a kind of processing technology of automobile piston rings special irregular steel wire.
Background technology
Automobile piston rings is the vital part in automobile engine, again consumable accessory simultaneously, the annual piston ring of manufacturing of China reaches several hundred million more than, piston ring in the process of using constantly and the sidewall friction of engine, so its wearability is just had to very large requirement in the manufacturing process of piston ring, same not only has requirement to wearability, and the toughness of piston ring is also had to very large requirement, prevents piston ring breakage and causes the problem of ring sticking cylinder.
Piston ring in the market all forms by casting, and it makes material is cast iron, more for further processing to it, but bubble easily appears in the piston ring inside of this cast iron, very easily fracture, the life-span of having reduced piston ring.
Notification number is the patent of CN100353047C, discloses a kind of technique with Foundry Production piston ring, and its processing step is the processing-thermal finalization-metalworking of casting-grinding-heat treatment-grinding-metalworking-laser reinforcing.
The production craft step that can find out this patent is many, final step is by thermal finalization, the overall structure of piston ring to be decided, so still, after cannot having got rid of piston ring, alveolate situation is deposited in inside, and in the process of thermal finalization, need to consume a large amount of energy, can cause certain pollution to environment simultaneously.
Summary of the invention
The deficiency existing for prior art, the object of the present invention is to provide a kind of piston ring inside processing not have bubble, and energy consumes the processing technology of low a kind of automobile piston rings special irregular steel wire.
For achieving the above object, the invention provides following technical scheme: a kind of processing technology of automobile piston rings special irregular steel wire, is characterized in that: comprise the following steps:
(1). feeding: the steel wire as stock is sent to cold-rolling mill the inside;
(2). cold rolling for the first time: the steel wire as stock, through cold-rolling mill rolling, is formed to embryo, and this process also can be called out embryo;
(3). bright annealing: embryo is heated to 750 degree ~ 820 degree at confined space, and annealing relief temperature is slow cooling to 300 degree ~ 500 degree or 200 degree ~ 300 degree at confined space, then it is cooling to carry out nature;
(4). cold rolling for the second time: the embryo through bright annealing, through the further rolling of cold-rolling mill, is formed to semi-finished product;
(5). roller draws: half-finished product is sent into roller and draw and in equipment, carry out roller and draw;
(6). die drawing: half-finished product is sent into and carried out die drawing in die drawing equipment;
(7). punching: will utilize punch press to go out through hole on half-finished product;
(8). the light tempering of quenching: half-finished product is sent in stove and quenched and tempering processing;
(9). collect: qualified product is collected by coiling machine.
By adopting technique scheme, in producing the process of piston ring, the first step, steel wire is sent to cold-rolling mill the inside to start cold rolling for the first time, second step, cold-rolling mill is rolled steel wire, start to change steel wire global shape, after rolling, the section of steel wire will become ellipse from circle, form embryo, the 3rd step, embryo is put into and in annealing furnace, carries out a bright annealing, after bright annealing, embryo there will be metallic luster on surface, and removed the original oxide layer in embryo surface, the surface of steel wire can not again be oxidized simultaneously, the 4th step, embryo through bright annealing is sent into cold-rolling mill again and carry out rolling for the second time, through current rolling, just embryo's global shape can be rolled out as the needed shape of automobile piston rings, as semi-finished product, the 5th step, the semi-finished product that form global shape are sent to roller to be drawn in equipment and carries out half-finished fining-off, make it to approach the technical indicator as automobile piston rings, the 6th step, if after drawing through the roller of the 5th step, this half-finished shape does not still reach needed index, just carry out final die drawing sizing, make it to reach completely as the needed technical indicator of automobile piston rings, the 7th step, on the piston ring of moulding, going out needed aperture completely, the 8th step, by completely the piston ring of moulding be sent to and in glowing furnace, carry out the light tempering operation of quenching, through light, quench after tempering, the mechanical performance of piston ring will be greatly improved, greatly increased the service life of piston ring, finally by coiling machine, the piston ring of finished product is collected, owing to by cold rolling and cold rolling for the second time for the first time, steel wire being machined into as the needed shape of automobile piston rings, by roller, draw with die drawing and complete the annular final processing of piston of automobile, by bright annealing, protect the metallic luster of piston of automobile ring surface, by light, return the mechanical performance that fire increases whole automobile piston rings product, above step is not all used casting technique, so just avoided because casting reason makes automobile piston rings inside occur bubble, its main technique is cold rolling, so the energy Ratios that this technique consumes is less, and can not pollute environment yet.
The present invention is further set to: described cold rolling cold-rolling mill used is for the first time initiatively two cold mills.
By adopting technique scheme, the roll of the initiatively two cold mills of the difference of initiatively two cold mills and passive pair of cold mill is meeting active rotation, with regard to not needing, the outer outside at cold-rolling mill arranges one and provides coiling machine to pull steel wire like this, so there will not be because the situation that excessive the produced steel wire of pulling force is broken, and initiatively the sound construction degree of heat transfer steel wire is out more much higher than passive.
The present invention is further set to: the two cold mills of described active comprise the first topping roll and the first bottom roll, and described the first topping roll and the first bottom roll both sides are equipped with stopping means.
By adopting technique scheme, the setting of stopping means just can be limited to the position of two rolls on certain position, just can effectively prevent because the rolling that the problem of roll location skew the causes substandard problem of shape of product out.
The present invention is further set to: described the first topping roll is provided with flange, and described the first bottom roll is provided with groove, and described flange and groove are suitable.
By adopting technique scheme, when making automobile piston rings, need on piston ring, roll out groove, roll in the past is only provided with flange, want to roll out groove and just seem very inconvenient, be provided with flange and groove simultaneously and just can fast piston ring be rolled out to groove, reduced a lot of operations.
The present invention is further set to: described cold rolling cold-rolling mill used is for the second time 4-roller cold rolling mill, described roll comprises the second topping roll, the second bottom roll, left roll and right roll, described left roll and right roll are active roll, and described the second topping roll and the second bottom roll are passive roll.
By adopting technique scheme, the section side of being due to piston ring, by four rolls, just can disposable piston ring be shaped, rather than form square by twice rolling, such rolling piston ring is out firmly more than twice rolling piston ring structure out, more difficult fracture.
The present invention is further set to: described busbar bright annealing technology is, first by ammonia decomposition device, ammonia is decomposed into hydrogen and is passed in stove, makes to be full of in stove hydrogen, and then product is put into and in stove, carried out annealing operation.
By adopting technique scheme, so just can protect the product in annealing by hydrogen, thereby effectively prevent the problem that product is oxidized with extraneous air generation chemical reaction under the environment of high temperature, for subsequent step provides convenience.
The present invention is further set to: the described light tempering process of quenching is, first stove inside is full of to nitrogen, then product is first carried out to hardening step, takes out cool to room temperature and carries out tempering operation later again.
By adopting technique scheme, by after this technique, will carry out to product the effect of a nitrogenize, the nitrogenize of this step of process just can improve the mechanical performance of whole product, has promoted the service life of product.
The present invention is further set to: described coiling machine comprises directive wheel, gathering sill and rolling frame, and described directive wheel is arranged on one end of gathering sill, and described rolling frame is arranged on the other end of gathering sill, and described rolling frame is vertical with horizontal plane.
By adopting technique scheme, by the setting of directive wheel, gathering sill and rolling frame, just can, directly by vertical being collected on rolling frame of the product having completed, just need to after having collected product, again rolling frame vertically not placed.
Accompanying drawing explanation
Fig. 1 is the process chart of automobile piston rings processing technology of the present invention;
Fig. 2 is two cold mill roll part-structure figure of automobile piston rings processing technology of the present invention;
Fig. 3 is the 4-roller cold rolling mill structure chart of automobile piston rings processing technology of the present invention;
Fig. 4 is the coiling machine structure chart of automobile piston rings processing technology of the present invention.
In figure: 1, feeding; 2, cold rolling for the first time; 3, bright annealing; 4, cold rolling for the second time; 5, roller draws; 6, die drawing; 7, punching; 8, the light tempering of quenching; 9, collect; 21, the first topping roll; 22, the first bottom roll; 23, stopping means; 211, flange; 221, groove; 41, the second topping roll, the 42, second bottom roll; 43, left roll; 44, right roll; 91, directive wheel; 92, gathering sill; 93, rolling frame.
The specific embodiment
Shown in Fig. 4, the processing technology of a kind of automobile piston rings special irregular steel wire of the present embodiment, is characterized in that: comprise the following steps:
(1). feeding 1: the steel wire as stock is sent to cold-rolling mill the inside;
(2). for the first time cold rolling 2: the steel wire as stock, through cold-rolling mill rolling, is formed to embryo, and this process also can be called out embryo;
(3). bright annealing 3: embryo is heated to 750 degree ~ 820 degree at confined space, and annealing relief temperature is slow cooling to 300 degree ~ 500 degree or 200 degree ~ 300 degree at confined space, then it is cooling to carry out nature.
(4). for the second time cold rolling 4: will, through the embryo of bright annealing 3 through the further rolling of cold-rolling mill, form semi-finished product.
(5). roller draws 5: half-finished product is sent into roller and draw and in 5 equipment, carry out roller and draw 5.
(6). die drawing 6: half-finished product is sent in die drawing 6 equipment and carried out die drawing 6.
(7). punching 7: will utilize punch press to go out through hole on half-finished product.
(8). the light tempering 8 of quenching: half-finished product is sent in stove and quenched and tempering processing.
(9). collect 9: qualified product is collected by coiling machine.
By adopting technique scheme, in producing the process of piston ring, the first step, steel wire is sent to cold-rolling mill the inside and starts for the first time cold rolling 2, second step, cold-rolling mill is rolled steel wire, start to change steel wire global shape, after rolling, the section of steel wire will become ellipse from circle, form embryo, preferably, this step need to circulate 3 times, the 3rd step, embryo is put into and in annealing furnace, carries out a bright annealing 3, after bright annealing 3, embryo there will be metallic luster on surface, and removed the original oxide layer in embryo surface, the surface of steel wire can not again be oxidized simultaneously, the 4th step, embryo through bright annealing 3 is sent into cold-rolling mill again and carry out rolling for the second time, through current rolling, just embryo's global shape can be rolled out as the needed shape of automobile piston rings, as semi-finished product, preferably, this step need to circulate 3 to 4 times, preferably, step 2 need to circulate 3 times to step 4, the 5th step, the semi-finished product that form global shape are sent to roller to be drawn in 5 equipment and carries out half-finished fining-off, make it to approach the technical indicator as automobile piston rings, the 6th step, if the roller through the 5th step draws after 5, this half-finished shape does not still reach needed index, just carry out 6 sizings of final die drawing, make it to reach completely as the needed technical indicator of automobile piston rings, the 7th step, on the piston ring of moulding, going out needed through hole completely, this through-hole aperture can decide according to client's needs, the 8th step, by completely the piston ring of moulding be sent to and in glowing furnace, carry out light tempering 8 operations of quenching, through light, quench after tempering 8, the mechanical performance of piston ring will be greatly improved, greatly increased the service life of piston ring, finally by coiling machine, the piston ring of finished product is collected, due to by cold rolling 2 and for the second time cold rolling 4 steel wire being machined into as the needed shape of automobile piston rings for the first time, by roller draw 5 and die drawing 6 complete the annular final processing of piston of automobile, by bright annealing 3, protect the metallic luster of piston of automobile ring surface, by light, return the mechanical performance that fire increases whole automobile piston rings product, above step is not all used casting technique, so just avoided because casting reason makes automobile piston rings inside occur bubble, its main technique is cold rolling, so the energy Ratios that this technique consumes is less, and can not pollute environment yet.
Described cold rolling 2 cold-rolling mills used are for the first time initiatively two cold mills.
By adopting technique scheme, the roll of the initiatively two cold mills of the difference of initiatively two cold mills and passive pair of cold mill is meeting active rotation, with regard to not needing, the outer outside at cold-rolling mill arranges one and provides coiling machine to pull steel wire like this, so there will not be because the situation that excessive the produced steel wire of pulling force is broken, and initiatively the sound construction degree of heat transfer steel wire is out more much higher than passive.
The two cold mills of described active comprise the first topping roll 21 and the first bottom roll 22, and described the first topping roll 21 and the first bottom roll 22 both sides are equipped with stopping means 23.
By adopting technique scheme, the setting of stopping means 23 just can be limited to the position of two rolls on certain position, just can effectively prevent because the rolling that the problem of roll location skew the causes substandard problem of shape of product out.
Described the first topping roll 21 is provided with flange 211, and described the first bottom roll 22 is provided with groove 221, and described flange 211 is suitable with groove 221.
By adopting technique scheme, when making automobile piston rings, need on piston ring, roll out groove 221, roll in the past is only provided with flange 211, want to roll out groove 221 and just seem very inconvenient, be provided with flange 211 and groove 221 simultaneously and just can fast piston ring be rolled out to groove 221, reduced a lot of operations.
Described cold rolling 4 cold-rolling mills used are for the second time 4-roller cold rolling mill, described roll comprises the second topping roll 41, the second bottom roll 42, left roll 43 and right roll 44, described left roll 43 and right roll 44 are active roll, and described the second topping roll 41 and the second bottom roll 42 are passive roll.
By adopting technique scheme, the section side of being due to piston ring, by four rolls, just can disposable piston ring be shaped, rather than form square by twice rolling, such rolling piston ring is out firmly more than twice rolling piston ring structure out, more difficult fracture.
Described bright annealing 3 techniques are, first by ammonia decomposition device, ammonia are decomposed into hydrogen and are passed in stove, make to be full of in stove hydrogen, and then product is put into and in stove, carried out annealing operation.
By adopting technique scheme, so just can protect the product in annealing by hydrogen, thereby effectively prevent the problem that product is oxidized with extraneous air generation chemical reaction under the environment of high temperature, for subsequent step provides convenience.
Described light tempering 8 techniques of quenching are, first stove inside are full of to nitrogen, then product are first carried out to hardening step, take out cool to room temperature and carry out tempering operation later again.
By adopting technique scheme, by after this technique, will carry out to product the effect of a nitrogenize, the nitrogenize of this step of process just can improve the mechanical performance of whole product, has promoted the service life of product.
Described coiling machine comprises directive wheel 91, gathering sill 92 and rolling frame 93, and described directive wheel 91 is arranged on one end of gathering sill 92, and described rolling frame 93 is arranged on the other end of gathering sill 92, and described rolling frame 93 is vertical with horizontal plane.
By adopting technique scheme, by the setting of directive wheel 91, gathering sill 92 and rolling frame 93, just can, directly by vertical being collected on rolling frame 93 of the product having completed, just need to after collecting 9 complete products, again rolling frame 93 vertically not placed.
The present invention has the following advantages: by cold rolling 2 and for the second time cold rolling 4 steel wire being machined into as the needed shape of automobile piston rings for the first time, by roller draw 5 and die drawing 6 complete the annular final processing of piston of automobile, by bright annealing 3, protect the metallic luster of piston of automobile ring surface, by light, return the mechanical performance that fire increases whole automobile piston rings product, above step is not all used casting technique, so just avoided because casting reason makes automobile piston rings inside occur bubble, its main technique is cold rolling, so the energy Ratios that this technique consumes is less, and can not pollute environment yet, in producing the process of piston ring, the first step, steel wire is sent to cold-rolling mill the inside and starts for the first time cold rolling 2, second step, cold-rolling mill is rolled steel wire, start to change steel wire global shape, after rolling, the section of steel wire will become ellipse from circle, form embryo, preferably, this step need to circulate 3 times, the 3rd step, embryo is put into and in annealing furnace, carries out a bright annealing 3, after bright annealing 3, embryo there will be metallic luster on surface, and removed the original oxide layer in embryo surface, the surface of steel wire can not again be oxidized simultaneously, the 4th step, embryo through bright annealing 3 is sent into cold-rolling mill again and carry out rolling for the second time, through current rolling, just embryo's global shape can be rolled out as the needed shape of automobile piston rings, as semi-finished product, preferably, this step need to circulate 3 to 4 times, preferably, step 2 need to circulate 3 times to step 4, the 5th step, the semi-finished product that form global shape are sent to roller to be drawn in 5 equipment and carries out half-finished fining-off, make it to approach the technical indicator as automobile piston rings, the 6th step, if the roller through the 5th step draws after 5, this half-finished shape does not still reach needed index, just carry out 6 sizings of final die drawing, make it to reach completely as the needed technical indicator of automobile piston rings, the 7th step, on the piston ring of moulding, going out needed through hole completely, this through-hole aperture can decide according to client's needs, the 8th step, by completely the piston ring of moulding be sent to and in glowing furnace, carry out light tempering 8 operations of quenching, through light, quench after tempering 8, the mechanical performance of piston ring will be greatly improved, greatly increased the service life of piston ring, finally by coiling machine, the piston ring of finished product is collected, due to by cold rolling 2 and for the second time cold rolling 4 steel wire being machined into as the needed shape of automobile piston rings for the first time, by roller draw 5 and die drawing 6 complete the annular final processing of piston of automobile, by bright annealing 3, protect the metallic luster of piston of automobile ring surface, by light, return the mechanical performance that fire increases whole automobile piston rings product, above step is not all used casting technique, so just avoided because casting reason makes automobile piston rings inside occur bubble, its main technique is cold rolling, so the energy Ratios that this technique consumes is less, and can not pollute environment yet.
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is also not only confined to above-described embodiment, and all technical schemes belonging under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1. a processing technology for automobile piston rings special irregular steel wire, is characterized in that: comprise the following steps:
(1). feeding: the steel wire as stock is sent to cold-rolling mill the inside;
(2). cold rolling for the first time, this process also can be called out embryo: the steel wire as stock, through cold-rolling mill rolling, is formed to embryo;
(3). bright annealing: embryo is heated to 750 degree ~ 820 degree at confined space, and annealing relief temperature is slow cooling to 300 degree ~ 500 degree or 200 degree ~ 300 degree at confined space, then it is cooling to carry out nature;
(4). cold rolling for the second time: the embryo through bright annealing, through the further rolling of cold-rolling mill, is formed to semi-finished product;
(5). roller draws: half-finished product is sent into roller and draw and in equipment, carry out roller and draw;
(6). die drawing: half-finished product is sent into and carried out die drawing in die drawing equipment;
(7). punching: will utilize punch press to go out through hole on half-finished product;
(8). the light tempering of quenching: half-finished product is sent in stove and quenched and tempering processing;
(9). collect: qualified product is collected by coiling machine.
2. the processing technology of automobile piston rings special irregular steel wire according to claim 1, is characterized in that: described cold rolling cold-rolling mill used is for the first time initiatively two cold mills.
3. the processing technology of automobile piston rings special irregular steel wire according to claim 2, is characterized in that: the two cold mills of described active comprise the first topping roll and the first bottom roll, and described the first topping roll and the first bottom roll both sides are equipped with stopping means.
4. the processing technology of automobile piston rings special irregular steel wire according to claim 3, is characterized in that: described the first topping roll is provided with flange, and described the first bottom roll is provided with groove, and described flange and groove are suitable.
5. according to the processing technology of the automobile piston rings special irregular steel wire described in claim 1 or 2 or 3 or 4, it is characterized in that: described cold rolling cold-rolling mill used is for the second time 4-roller cold rolling mill, described roll comprises the second topping roll, the second bottom roll, left roll and right roll, described left roll and right roll are active roll, and described the second topping roll and the second bottom roll are passive roll.
6. the processing technology of automobile piston rings special irregular steel wire according to claim 1, it is characterized in that: described busbar bright annealing technology is, first by ammonia decomposition device, ammonia being decomposed into hydrogen is passed in stove, make to be full of in stove hydrogen, and then product is put into and in stove, carried out annealing operation.
7. the processing technology of automobile piston rings special irregular steel wire according to claim 6, it is characterized in that: the described light tempering process of quenching is, first stove inside is full of to nitrogen, then product is first carried out to hardening step, take out cool to room temperature and carry out again tempering operation later.
8. according to the processing technology of the automobile piston rings special irregular steel wire described in claim 1 or 2 or 3 or 4, it is characterized in that: described coiling machine comprises directive wheel, gathering sill and rolling frame, described directive wheel is arranged on one end of gathering sill, described rolling frame is arranged on the other end of gathering sill, and described rolling frame is vertical with horizontal plane.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410088056.7A CN104002098A (en) | 2014-03-11 | 2014-03-11 | Processing technic of deformed steel wire special for automobile piston ring |
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| CN201410088056.7A CN104002098A (en) | 2014-03-11 | 2014-03-11 | Processing technic of deformed steel wire special for automobile piston ring |
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Cited By (7)
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| CN104805273A (en) * | 2015-04-01 | 2015-07-29 | 安国清 | Hardness treatment method for piston ring in pneumatic nail gun cavity |
| CN105414173A (en) * | 2014-09-15 | 2016-03-23 | 中国人民解放军军械工程学院 | Irregular-shaped steel wire hot rolling equipment |
| CN105537266A (en) * | 2016-02-22 | 2016-05-04 | 中钢集团郑州金属制品研究院有限公司 | Method for forming irregularly-shaped steel wire with S-shaped cross section |
| CN106734272A (en) * | 2016-12-28 | 2017-05-31 | 东莞市科力钢铁线材有限公司 | The bicycle speed-varying unit asymmetric special-shaped line production and processing technology in section |
| CN108296303A (en) * | 2018-01-19 | 2018-07-20 | 广州众山金属科技有限公司 | Rolling for profile shapes class product draws Joint Production equipment and its rolls drawing production technology |
| CN111589996A (en) * | 2020-06-10 | 2020-08-28 | 无锡商业职业技术学院 | Piston ring preparation process and laminated high-sealing piston ring obtained by adopting same |
| CN113652531A (en) * | 2021-07-20 | 2021-11-16 | 姜敏 | Annealing process of special-shaped rolled steel wire |
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| CN105537266A (en) * | 2016-02-22 | 2016-05-04 | 中钢集团郑州金属制品研究院有限公司 | Method for forming irregularly-shaped steel wire with S-shaped cross section |
| CN106734272A (en) * | 2016-12-28 | 2017-05-31 | 东莞市科力钢铁线材有限公司 | The bicycle speed-varying unit asymmetric special-shaped line production and processing technology in section |
| CN108296303A (en) * | 2018-01-19 | 2018-07-20 | 广州众山金属科技有限公司 | Rolling for profile shapes class product draws Joint Production equipment and its rolls drawing production technology |
| CN111589996A (en) * | 2020-06-10 | 2020-08-28 | 无锡商业职业技术学院 | Piston ring preparation process and laminated high-sealing piston ring obtained by adopting same |
| CN113652531A (en) * | 2021-07-20 | 2021-11-16 | 姜敏 | Annealing process of special-shaped rolled steel wire |
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Application publication date: 20140827 |