CN104525614A - Production process of alloy steel material for high-strength internal hexagonal wrench - Google Patents

Production process of alloy steel material for high-strength internal hexagonal wrench Download PDF

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Publication number
CN104525614A
CN104525614A CN201410629637.7A CN201410629637A CN104525614A CN 104525614 A CN104525614 A CN 104525614A CN 201410629637 A CN201410629637 A CN 201410629637A CN 104525614 A CN104525614 A CN 104525614A
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China
Prior art keywords
wire rod
alloy steel
circular
spheroidizing
steel material
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CN201410629637.7A
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Chinese (zh)
Inventor
王斯华
邓之强
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DONGGUAN KELEE STEEL WIRE Co Ltd
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DONGGUAN KELEE STEEL WIRE Co Ltd
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Priority to CN201410629637.7A priority Critical patent/CN104525614A/en
Publication of CN104525614A publication Critical patent/CN104525614A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/04Manufacture 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
    • B21C37/045Manufacture of wire or bars with particular section or properties
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26Methods of annealing
    • C21D1/32Soft annealing, e.g. spheroidising
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/065Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys

Abstract

The invention discloses a production process of an alloy steel material for a high-strength internal hexagonal wrench. The production process comprises the following steps of 1, material selecting, wherein a material with the trade mark of 50CrVa is selected as a base material; 2, round drawing; 3, spheroidizing annealing; 4, acid pickling; 5, phosphating; 6, saponifying; 7, hexagon drawing. By selecting specific material and adopting specific matched drawing process and spheroidizing process, a wire made according to the invention has relatively high plastic deformation capability, meets the bending forming requirements of customers, is uniform in annealed structure grains, is high in rate of spheroidization and is free of abnormal structures; the product size is stable, the precision is high, the tolerance of opposite sides is +/-0.02mm, and the tolerance of opposite angles is +/-0.03mm; the material meets the use requirements of the customers, after the material is subjected to quenched-tempered heat treatment, the hardness HRC of the obtained wrench is greater than or equal to 55, the wear resistance is good, and the service life is long; meanwhile, the softening time in the spheroidizing annealing working procedure is shortened by a larger margin, and the goals of shortening the production cycle, reducing energy consumption, raising work productivity, reducing the production cost, protecting the environment and the like are achieved.

Description

A kind of production technology of high strength inner hexagon spanner alloy steel material
Technical field
The present invention relates to wire rod process field technology, refer in particular to a kind of production technology of high strength inner hexagon spanner alloy steel material.
Background technology
Inner hexagon spanner is also allen wrench, common English name has " Allen key(or Allen wrench) " and " Hex key " (or Hex wrench).The action that " wrench " expression in title " is turned round ", it embodies most important difference between inner hexagon spanner and other common instruments (such as: straight screwdriver and Phillips screwdriver), it applies the active force to screw by moment of torsion, and what greatly reduce user uses force intensity.So to say that, in the erecting tools involved by modern furniture industry, although inner hexagon spanner is not the most frequently used, but it is the most handy, inner hexagon spanner can spread so far, and becoming useful tool indispensable in industrial manufacturing industry, key is the unique distinction that itself has and plurality of advantages: 1. it is very simple and light and handy; 2. between hexagon socket head cap screw and spanner, have six contact surfaces, stressed fully and be not easy to damage; 3. can be used for screw in stubborn deep hole; 4. the diameter of spanner and length determine its twisting resistance; 5. can be used for twisting very little screw; 6. easily manufacture, with low cost; 7. the two ends of spanner can use.
Along with the fast development of Investment in fastener industry, its related accessories industry is also rapidly developed, and also proposes higher requirement to quality requirement simultaneously, according to statistics, makes the material of inner hexagon spanner, comprises low-carbon (LC), middle carbon and steel alloy wire rod.After these spanner access times reach certain number of times, easy wearing and tearing, until diameter is less than normal size, cannot screwing screw again, normally cannot use, need change spanner, the die nut that all high-frequencies use is all that high-strength wire material processes substantially, therefore, the quality of ferrous materials is extremely important.
Owing to adopting alloy steel material to manufacture high strength inner hexagon spanner, not only efficiency is high, quality good, and materials are economized, cost is low, so alloy steel material material is widely applied in the die nut manufacture of the industrial use of furniture.High strength inner hexagon spanner is manufactured for employing alloy steel material, the production technology of standard component: wire rod → drawing → spheroidizing → pickling → phosphatization → saponification → hexagonal drawing → rush short → bending and molding → heat treatment (modifier treatment) → electroplating surface → inspection warehouse-in, wherein in bending and molding process, the original structure of steel directly can affect crystallized ability during Bending Processing.In Forging Process, bending angle is all 90 ° substantially, and knuckle place radian is also very little, is usually less than radius bend and is less than 0.5mm, and therefore require that raw-material plasticity is good, hardness is low as far as possible.
The object of spheroidizing obtains the microstructure and mechanical property required for following process (drawing and cold-heading etc.), therefore nodularization effect is very large on the impact of bending and molding qualification rate, steel is after spheroidizing simultaneously, can obtain equally distributed spherical or granular carbide on ferrite matrix, general title is this is organized as spherical or granular pearlite.During globular pearlite heating, austenitic formation speed is slow, and during Quench heating, austenite crystal is not easily grown up, and steel part quenching distortion is rarely found with cracking.Original structure is the steel of globular pearlite, and after quenching, carbide is the distribution of fine particle shape therefore makes hardened steel have higher intensity and toughness.Current this spheroidizing sofening treatment is operation that is the most consuming time in securing member manufacture process, power consumption, and the cycle is about 30 hours.
Summary of the invention
Given this, the present invention is directed to the disappearance of prior art existence, its main purpose is to provide a kind of production technology of high strength inner hexagon spanner alloy steel material, it effectively can solve existing production technology time consumption and energy consumption and product plastic deformation ability is low, can not meet the problem of client's bending and molding requirement.
For achieving the above object, the present invention adopts following technical scheme:
A production technology for high strength inner hexagon spanner alloy steel material, comprises the following steps:
(1) selection: select the trade mark to be that 50CrVa material is as mother metal;
(2) circular drawing: adopt drawbench by mother metal repeatedly drawing, to obtain the circular wire rod of required specification, compression ratio≤20% of each drawing, total draught >=40%;
(3) spheroidizing: circular wire rod is hung in atmosphere protection stove, protective atmosphere is added with in atmosphere protection stove, then circular wire rod is warmed up to more than austenite transformation temperature 20 ~ 30 DEG C, be incubated 4 ~ 6 hours, and then progressively cool to below austenite transformation temperature 20 ~ 30 DEG C with 10 DEG C/h, be incubated 3 ~ 4 hours, then cool to the furnace and come out of the stove, austenite transformation temperature is 720 DEG C;
(4) pickling: utilize the oxide skin on acid solution removal wire surface;
(5) phosphatization: carry out phosphorating treatment to wire rod, makes to form phosphating coat on the surface at wire rod;
(6) saponification: carry out saponification process to wire rod, to improve the protective of phosphating coat;
(7) hexagonal drawing: carry out drawing to wire rod, to obtain the hexagon wire rod of required specification.
As a kind of preferred version, described protective atmosphere is methyl alcohol, and methanol stream amount is 10ml/min.
The present invention compared with prior art has obvious advantage and beneficial effect, specifically, as shown from the above technical solution:
By selecting certain material, and coordinating specific drawing process and spheriodization process thereof, making the wire rod obtained according to the inventive method have higher plastic deformation ability, meet the requirement of client's bending and molding, annealed structure crystal grain is even, and Oxygen potential is high, tissue without exception; Product size is stablized, and precision is high, and tolerance is at ± 0.02mm; Material meets client's instructions for use, hardness HRC >=55 after Tempering and Quenching, and wearability is good, long service life, can be applied to automobile industry better, improves serviceability and the life-span of product, improves industry level of processing, have good market prospects; Shorten spheroidizing simultaneously by a relatively large margin and soften time operation, reach the shortening production cycle, reduce energy consumption, raise labour productivity, reduce the object such as production cost, protection of the environment, the company of can be creates considerable economic benefit.
For more clearly setting forth architectural feature of the present invention and effect, below in conjunction with accompanying drawing and specific embodiment, the present invention is described in detail.
Accompanying drawing explanation
Fig. 1 is the production procedure schematic diagram of the preferred embodiment of the present invention.
Detailed description of the invention
Please refer to shown in Fig. 1, the present invention discloses a kind of production technology of high strength inner hexagon spanner alloy steel material, comprises the following steps:
(1) selection: the mechanical property of ferrous materials is main form with its chemical composition and microscopic structure relevant, controlling chemical composition ranges can make mechanical performance be greatly improved, therefore selecting just to seem particularly important to raw material, and the serviceability performance of alloying element to ferrous materials is even more serious, related data shows, add chromium element in material and can improve hardenability, improve wearability, improve corrosion resistance, and keep intensity under being conducive to high temperature, add v element, the grain structure of energy refinement steel, improve the intensity of steel, toughness and wearability, when it fuses into austenite at high temperature, the quenching degree of steel can be increased.In the present invention, the trade mark is selected to be that 50CrVa material is as mother metal, strict demand is had to material alloys element Cr, V content, it is made to meet subsequent heat treatment requirement, especially S, P content is strictly controlled when receiving inspection simultaneously, to Segregation of Chemical Composition, the stability aspect of interior tissue situation, original size precision and various performance inconsistency more strictly controls, to meet the needs of production.
(2) circular drawing: adopt drawbench by mother metal repeatedly drawing, to obtain the circular wire rod of required specification, compression ratio≤20% of each drawing, total draught >=40%.Total draught is large, its deflection produced is larger, the interior tissue of steel wire by the drawing-down of machinery, draw broken, produce stress value higher, for follow-up spheroidizing provides more energy, Oxygen potential is improved, plasticity improves, take little Partial shrinkage rate simultaneously, Steel Wire Surface work-hardening capacity in process is significantly reduced, stability of enhancing product performance.
(3) spheroidizing: spheroidizing is one of Basic Ways improving structure of steel and performance, the main purpose of spheroidizing is the carbide spheroidization made in the microstructure of ferrous materials, reduce the hardness of material, improve the plasticity of material, reduce the resistance of deformation of material, make material be easy to plastic working to be shaped, therefore will obtain ideal performance and tissue, key selects suitable annealing process.In the present invention; hung in by circular wire rod in atmosphere protection stove, be added with protective atmosphere in atmosphere protection stove, described protective atmosphere is methyl alcohol; methanol stream amount is 10ml/min; then circular wire rod is warmed up to more than austenite transformation temperature 20 ~ 30 DEG C, is incubated 4 ~ 6 hours, and then progressively cools to below austenite transformation temperature 20 ~ 30 DEG C with 10 DEG C/h; be incubated 3 ~ 4 hours; cool to the furnace and come out of the stove, to guarantee it not by decarburization, austenite transformation temperature is 720 DEG C.Whole spheroidizing process key is to control temperature, if holding temperature is too high, cementite will evenly be dissolved in austenite, thus form single uniform austenite structure, theoretical according to nodularization, uniform austenite is difficult to be transformed into spheroidite tissue, in like manner, when holding temperature is lower, cementite by abundant molten disconnected, is not also difficult to obtain spherodized structure.
(4) pickling: utilize the oxide skin on acid solution removal wire surface, acid cleaning process is existing mature technology, does not describe in detail acid cleaning process at this.
(5) phosphatization: carry out phosphorating treatment to wire rod, make to form phosphating coat on the surface at wire rod, phosphating process is existing mature technology, does not describe in detail phosphating process at this.
(6) saponification: carry out saponification process to wire rod, to improve the protective of phosphating coat, saponification process is existing mature technology, does not describe in detail saponification process at this.
(7) hexagonal drawing: carry out drawing to wire rod, to obtain the hexagon wire rod of required specification.
The present invention will be described to use specific embodiment below.
Embodiment 1
(1) selection: select the trade mark to be that 50CrVa material is as mother metal.
(2) circular drawing: adopt drawbench by mother metal repeatedly drawing, to obtain the circular wire rod of required specification, the compression ratio of each drawing is 10%, and total draught is 40%.
(3) spheroidizing: circular wire rod is hung in atmosphere protection stove; protective atmosphere is added with in atmosphere protection stove; described protective atmosphere is methyl alcohol; methanol stream amount is 10ml/min, then circular wire rod is warmed up to more than austenite transformation temperature 20 DEG C, is incubated 4 hours; and then progressively cool to below austenite transformation temperature 20 DEG C with 10 DEG C/h; be incubated 3 hours, then cool to the furnace and come out of the stove, austenite transformation temperature is 720 DEG C.
(4) pickling: utilize the oxide skin on acid solution removal wire surface.
(5) phosphatization: carry out phosphorating treatment to wire rod, makes to form phosphating coat on the surface at wire rod.
(6) saponification: carry out saponification process to wire rod, to improve the protective of phosphating coat.
(7) hexagonal drawing: carry out drawing to wire rod, to obtain the hexagon wire rod of required specification.
Wire rod through the present embodiment process is carried out the inspection of Oxygen potential, dimensional tolerance and decarburized layer deepness, the method of inspection of Oxygen potential, dimensional tolerance and decarburized layer deepness is existing mature technology, at this, method that Oxygen potential, dimensional tolerance and decarburized layer deepness are checked is not described in detail, the data that inspection obtains are: nodulizing grade is 5 grades, opposite side dimensional tolerance ± 0.02mm, diagonal-size tolerance is ± 0.03mm, decarburized layer deepness≤product diameter 1%.Further, product obtains the hardness HRC of inner hexagon spanner after bending and molding and Tempering and Quenching is 55.
Embodiment 2
(1) selection: select the trade mark to be that 50CrVa material is as mother metal.
(2) circular drawing: adopt drawbench by mother metal repeatedly drawing, to obtain the circular wire rod of required specification, the compression ratio of each drawing is 15%, and total draught is 44.8%.
(3) spheroidizing: circular wire rod is hung in atmosphere protection stove; protective atmosphere is added with in atmosphere protection stove; described protective atmosphere is methyl alcohol; methanol stream amount is 10ml/min, then circular wire rod is warmed up to more than austenite transformation temperature 25 DEG C, is incubated 5 hours; and then progressively cool to below austenite transformation temperature 25 DEG C with 10 DEG C/h; be incubated 3.5 hours, then cool to the furnace and come out of the stove, austenite transformation temperature is 720 DEG C.
(4) pickling: utilize the oxide skin on acid solution removal wire surface.
(5) phosphatization: carry out phosphorating treatment to wire rod, makes to form phosphating coat on the surface at wire rod.
(6) saponification: carry out saponification process to wire rod, to improve the protective of phosphating coat.
(7) hexagonal drawing: carry out drawing to wire rod, to obtain the hexagon wire rod of required specification.
Wire rod through the present embodiment process is carried out the inspection of Oxygen potential, dimensional tolerance and decarburized layer deepness, the method of inspection of Oxygen potential, dimensional tolerance and decarburized layer deepness is existing mature technology, at this, method that Oxygen potential, dimensional tolerance and decarburized layer deepness are checked is not described in detail, the data that inspection obtains are: nodulizing grade is 6 grades, opposite side dimensional tolerance ± 0.02mm, diagonal-size tolerance is ± 0.03mm, decarburized layer deepness≤product diameter 1%.Further, product obtains the hardness HRC of inner hexagon spanner after bending and molding and Tempering and Quenching is 58.
Embodiment 3
(1) selection: select the trade mark to be that 50CrVa material is as mother metal.
(2) circular drawing: adopt drawbench by mother metal repeatedly drawing, to obtain the circular wire rod of required specification, the compression ratio of each drawing is 20%, and total draught is 48.8%.
(3) spheroidizing: circular wire rod is hung in atmosphere protection stove; protective atmosphere is added with in atmosphere protection stove; described protective atmosphere is methyl alcohol; methanol stream amount is 10ml/min, then circular wire rod is warmed up to more than austenite transformation temperature 30 DEG C, is incubated 6 hours; and then progressively cool to below austenite transformation temperature 30 DEG C with 10 DEG C/h; be incubated 4 hours, then cool to the furnace and come out of the stove, austenite transformation temperature is 720 DEG C.
(4) pickling: utilize the oxide skin on acid solution removal wire surface.
(5) phosphatization: carry out phosphorating treatment to wire rod, makes to form phosphating coat on the surface at wire rod.
(6) saponification: carry out saponification process to wire rod, to improve the protective of phosphating coat.
(7) hexagonal drawing: carry out drawing to wire rod, to obtain the hexagon wire rod of required specification.
Wire rod through the present embodiment process is carried out the inspection of Oxygen potential, dimensional tolerance and decarburized layer deepness, the method of inspection of Oxygen potential, dimensional tolerance and decarburized layer deepness is existing mature technology, at this, method that Oxygen potential, dimensional tolerance and decarburized layer deepness are checked is not described in detail, the data that inspection obtains are: nodulizing grade is 6 grades, opposite side dimensional tolerance ± 0.02mm, diagonal-size tolerance is ± 0.03mm, decarburized layer deepness≤product diameter 1%.Further, product obtains the hardness HRC of inner hexagon spanner after bending and molding and Tempering and Quenching is 57.
As can be seen from the various embodiments described above, the properties of wire rod is obviously superior to existing market similar products, better can be applied to automobile industry, improves serviceability and the life-span of product, have good market prospects, the company of can be creates considerable economic benefit.
The above, it is only preferred embodiment of the present invention, not technical scope of the present invention is imposed any restrictions, thus every above embodiment is done according to technical spirit of the present invention any trickle amendment, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.

Claims (2)

1. a production technology for high strength inner hexagon spanner alloy steel material, is characterized in that: comprise the following steps:
(1) selection: select the trade mark to be that 50CrVa material is as mother metal;
(2) circular drawing: adopt drawbench by mother metal repeatedly drawing, to obtain the circular wire rod of required specification, compression ratio≤20% of each drawing, total draught >=40%;
(3) spheroidizing: circular wire rod is hung in atmosphere protection stove, protective atmosphere is added with in atmosphere protection stove, then circular wire rod is warmed up to more than austenite transformation temperature 20 ~ 30 DEG C, be incubated 4 ~ 6 hours, and then progressively cool to below austenite transformation temperature 20 ~ 30 DEG C with 10 DEG C/h, be incubated 3 ~ 4 hours, then cool to the furnace and come out of the stove, austenite transformation temperature is 720 DEG C;
(4) pickling: utilize the oxide skin on acid solution removal wire surface;
(5) phosphatization: carry out phosphorating treatment to wire rod, makes to form phosphating coat on the surface at wire rod;
(6) saponification: carry out saponification process to wire rod, to improve the protective of phosphating coat;
(7) hexagonal drawing: carry out drawing to wire rod, to obtain the hexagon wire rod of required specification.
2. the production technology of a kind of high strength inner hexagon spanner alloy steel material according to claim 1, it is characterized in that: described protective atmosphere is methyl alcohol, methanol stream amount is 10ml/min.
CN201410629637.7A 2014-11-11 2014-11-11 Production process of alloy steel material for high-strength internal hexagonal wrench Pending CN104525614A (en)

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Cited By (11)

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Publication number Priority date Publication date Assignee Title
CN104988402A (en) * 2015-05-29 2015-10-21 海盐宇星螺帽有限责任公司 Galvanized nut machining technology
CN105268759A (en) * 2015-11-04 2016-01-27 无锡翱天钢丝制品有限公司 Bad cold-upset steel wire reformation and reuse process
CN105525223A (en) * 2015-12-29 2016-04-27 东莞市科力钢铁线材有限公司 Production process for super-plastic steel and iron material for large-diameter hexagon bolt
CN105568146A (en) * 2015-12-29 2016-05-11 东莞市科力钢铁线材有限公司 Production process of tiny chamfering special-shaped line for precise products
CN105568155A (en) * 2015-12-29 2016-05-11 东莞市科力钢铁线材有限公司 Production process of super-plasticity low-carbon steel material used for turning rivet
CN106544494A (en) * 2017-01-18 2017-03-29 中钢集团郑州金属制品研究院有限公司 A kind of online soft annealing method suitable for 1Cr17Ni2 rustless steel cold pull wires
CN108246818A (en) * 2017-12-28 2018-07-06 东莞科力线材技术有限公司 A kind of car belt pull rod mild steel material and its preparation process
CN111378905A (en) * 2018-12-29 2020-07-07 东莞科力线材技术有限公司 Preparation method of fastener wire of baby carrier
CN111375649A (en) * 2018-12-29 2020-07-07 东莞科力线材技术有限公司 Preparation method of automobile fastener wire
CN111876677A (en) * 2020-07-14 2020-11-03 昆山正通铭金属有限公司 Forming process of hexagonal alloy tool steel S2
CN112845578A (en) * 2020-12-21 2021-05-28 中天钢铁集团有限公司 Production method of alloy spring steel wire with excellent drawing performance

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104988402A (en) * 2015-05-29 2015-10-21 海盐宇星螺帽有限责任公司 Galvanized nut machining technology
CN105268759A (en) * 2015-11-04 2016-01-27 无锡翱天钢丝制品有限公司 Bad cold-upset steel wire reformation and reuse process
CN105525223A (en) * 2015-12-29 2016-04-27 东莞市科力钢铁线材有限公司 Production process for super-plastic steel and iron material for large-diameter hexagon bolt
CN105568146A (en) * 2015-12-29 2016-05-11 东莞市科力钢铁线材有限公司 Production process of tiny chamfering special-shaped line for precise products
CN105568155A (en) * 2015-12-29 2016-05-11 东莞市科力钢铁线材有限公司 Production process of super-plasticity low-carbon steel material used for turning rivet
CN106544494A (en) * 2017-01-18 2017-03-29 中钢集团郑州金属制品研究院有限公司 A kind of online soft annealing method suitable for 1Cr17Ni2 rustless steel cold pull wires
CN108246818A (en) * 2017-12-28 2018-07-06 东莞科力线材技术有限公司 A kind of car belt pull rod mild steel material and its preparation process
CN111378905A (en) * 2018-12-29 2020-07-07 东莞科力线材技术有限公司 Preparation method of fastener wire of baby carrier
CN111375649A (en) * 2018-12-29 2020-07-07 东莞科力线材技术有限公司 Preparation method of automobile fastener wire
CN111876677A (en) * 2020-07-14 2020-11-03 昆山正通铭金属有限公司 Forming process of hexagonal alloy tool steel S2
CN111876677B (en) * 2020-07-14 2021-09-21 昆山正通铭金属有限公司 Forming process of hexagonal alloy tool steel S2
CN112845578A (en) * 2020-12-21 2021-05-28 中天钢铁集团有限公司 Production method of alloy spring steel wire with excellent drawing performance

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