CN104275575A - Cold-drawing machining process for lead-containing free-cutting steel wire rods - Google Patents
Cold-drawing machining process for lead-containing free-cutting steel wire rods Download PDFInfo
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- CN104275575A CN104275575A CN201310294104.3A CN201310294104A CN104275575A CN 104275575 A CN104275575 A CN 104275575A CN 201310294104 A CN201310294104 A CN 201310294104A CN 104275575 A CN104275575 A CN 104275575A
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- 238000010622 cold drawing Methods 0.000 title claims abstract description 20
- 238000003754 machining Methods 0.000 title abstract 5
- 229910000915 Free machining steel Inorganic materials 0.000 title abstract 2
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 69
- 239000010959 steel Substances 0.000 claims abstract description 69
- 238000000137 annealing Methods 0.000 claims abstract description 48
- 238000005098 hot rolling Methods 0.000 claims abstract description 18
- 238000004513 sizing Methods 0.000 claims abstract description 16
- 238000005097 cold rolling Methods 0.000 claims abstract description 6
- 238000005242 forging Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 44
- 238000005096 rolling process Methods 0.000 claims description 35
- 238000005520 cutting process Methods 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 20
- 238000003801 milling Methods 0.000 claims description 20
- 238000005491 wire drawing Methods 0.000 claims description 20
- 238000009413 insulation Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 9
- 230000002950 deficient Effects 0.000 claims description 6
- 238000009941 weaving Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- 238000007616 round robin method Methods 0.000 claims description 2
- 238000003723 Smelting Methods 0.000 claims 7
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000007547 defect Effects 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- 230000008676 import Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
- B23P13/00—Making metal objects by operations essentially involving machining but not covered by a single other subclass
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Steel (AREA)
- Metal Rolling (AREA)
Abstract
The invention relates to a cold-drawing machining process for lead-containing free-cutting steel. The cold-drawing machining process comprises the following steps: (1) forging; (2) hot rolling; (3) annealing; (4) straightening, cold-rolling sizing and scalping; (5) cold drawing and bright annealing. By adopting the machining process for steel wire rods provided by the invention, finished wire rods having superior surface quality such as freeness from internal cracks, shrinkage holes, looseness and the like and having uniform performance can be obtained, the production and machining requirements are met, and even the quality of the finished wire rods reaches or exceeds the quality of imported wire rods of the same type.
Description
Technical field
The present invention relates to a kind of processing technology of steel, particularly relate to a kind of processing technology of lead treated steel.
Background technology
Automatic steel (abbreviation automatic steel) is by adding the appropriate chemical element (claiming Cutting free element) that can improve machinability, thus obtains the steel grade of good machinability.By Cutting free element classification, current automatic steel kind mainly contains sulphur automatic steel, lead and easy-cutting steel, calcium and easy-cutting steel, titanium automatic steel and compound automatic steel.
Lead wherein in lead and easy-cutting steel content in automatic steel is general≤and 0.35%, there are independent leading and compound leading.Plumbous general with the spherical particle individualism of 1 ~ 2 μm in steel, or be attached on the field trashes such as sulfide, thus its size and the degree of being uniformly dispersed become the key point of steel processed.Lead and easy-cutting steel, in cutting process, produces strong friction between cutting tool and iron filings, make the plumbous particulate be distributed in steel be that molten condition is separated out, produce lubrication, play antifriction function, make chip in small, broken bits, tool bit life, thus the cutting ability improving steel.In addition, lead also easily makes chip curling and plays embrittling effect, improves chip breaking characteristic.Lead and easy-cutting steel anisotropy is little, therefore its mechanical property ratio sulphur automatic steel is good, is generally used for more important structural member, is widely used as the strength member manufacturing precision instrument part, auto parts, all kinds of machinery.
Cold drawing process just refers to that under normal temperature state, cross together cold drawn mould to bar or wire rod carries out drawing, can be a drawing or repeatedly drawing.Institute's raw material diameter diminish or a kind of processing technology of the alternation of cross-section cold drawn.As: round steel can utilize, sintered-carbide die is directly cold drawn becomes hexagonal steel.The quality of the cold drawing process of steel directly affects the quality of cold drawn rear steel, thus affects its effect in use.The technological process of production cold drawn is at present generally: hot rolling coils → and pickling → cold drawn → soft annealing → gently draw → align → polish stick → overcoat copper pipe → hot drawing → crop → welding → cold-drawn semi-finished product → annealing → cold drawn finished silk → oxidation processes → painting boron → finished product.Above-mentioned complex manufacturing, and pollute because pickling can produce environment aborning.
In process, also there are some problems in general finished wire rod, as alignment out-of-flatness, lower hobbing quality inequality, boring aperture deviation, broken drill, pressure pearl there is crack on end side, chip not easily derives.Certainly above-mentioned defective workmanship also there will be in the cold drawn processing of lead treated steel wire rod.
The processing technology so how developing a steel wire rod has excellent surface quality as material internal flawless, shrinkage cavity, defect and the uniform finished wire rod of performance such as loose to obtain, meet and produce and processing needs, meet or exceed the quality of similar import wire rod, become the problem that is worth research.
Summary of the invention
The object of the present invention is to provide a kind of cold drawing process firm containing lead and easy-cutting.The processing technology of steel wire rod provided by the present invention can obtain has excellent surface quality as material internal flawless, shrinkage cavity, defect and the uniform finished wire rod of performance such as loose, meets and produces and processing needs, meet or exceed the quality of similar import wire rod.
The cold drawing process of lead treated steel provided by the present invention, comprises the steps:
(1) forge: according to intermediate frequency furnace steel ingot forging regulation, resmelting ingot is forged into steel ingot;
(2) hot rolling: heating, hot rolling, batches, cooling;
(3) anneal: adopt industrial energy saving resistance furnace, heating-up temperature is 800 ~ 900 DEG C, preferably 850 DEG C, insulation 3 ~ 5h, is chilled to less than 500 DEG C stoves cold after preferred 4h.For making steel obtain best serviceability and cold-drawn can be carried out smoothly, need after hot rolling to anneal.
(4) align, cold rolling sizing and stripping off the skin: adopting oblique Two-roll straightening cutting machine to align after stainless steel annealing, and shear scale, sizing, then strip off the skin, vertical bar being carried out to being welded into Kinds of Heavy Coil, rolling;
(5) cold drawn and bright annealing: carry out cold drawn on wire drawing machine, the diameter after wire drawing is controlled by wire drawing die, bright annealing temperature is 800 ~ 900 DEG C, preferably 850 DEG C, insulation 0.5 ~ 2h, cold drawn circulation with bright annealing is carried out, i.e. cold drawn → bright annealing → cold drawn → bright annealing → cold drawn → bright annealing → cold drawn.
As optimal technical scheme, in the cold drawing process step (1) of lead treated steel provided by the present invention, steel ingot specification is 50mm × 50mm × L;
Preferably, by steel ingot excision end to end.It is the part in order to remove containing the defect such as slag charge and shrinkage cavity.
As optimal technical scheme, the technological process of the cold drawing process step (2) of lead treated steel provided by the present invention is: roll → pre-the finish rolling of 280 milling train (rolling a water-cooled) → crop end → 250 milling train finish rolling (rolling a water-cooled) → 210 rod-rolling mills → lopping → water-cooled of weaving silk in stokehold material loading → heating steel billet → 460 milling train roughing → crop end → 350 milling train.
As optimal technical scheme, in the cold drawing process step (2) of lead treated steel provided by the present invention, hot rolling adopts pusher to push heating furnace heating, heating-up temperature is 1220 ~ 1250 DEG C, start rolling temperature (1100 ± 20) DEG C, lopping of weaving silk after being rolled into Φ 6.5mm dimension wire, laying temperature (900 ± 20) DEG C, then water-cooled is carried out, collection reel circle wire rod, defective part sub-cut is clean end to end, checks surface.Check that must not there be the defect such as crackle, folding, cut, the ears or side handles of a utensil, projection, pitted skin on surface.
As optimal technical scheme, the middle scale of cold drawing process step (4) of lead treated steel provided by the present invention, sizing are the vertical bar of Φ 6.5mm × 2000mm, strip off the skin and to carry out on XF-WXC type whirlwind Centreless lathe, cutting depth is 0.25mm, and after stripping off the skin, diameter is Φ 6.0mm.
As optimal technical scheme, cold drawnly in the cold drawing process step (5) of lead treated steel provided by the present invention to carry out on high speed wiredrawing bench, preferred LW560 type high speed wiredrawing bench.
As optimal technical scheme, cold drawn in the cold drawing process step (5) of lead treated steel provided by the present invention is 7 passes of drawing.In order to the defect eliminated because producing in drawing process and occur the problems such as drawing is motionless, with reference to wire drawing die specification and stainless end product drawing deformation rate (ε=20% during d> Φ 4.0mm, ε=20% during d< Φ 4.0mm), passage ultimate deformation (ε≤5%), be defined as 7 passes of drawing.
As optimal technical scheme, cold drawnly in the cold drawing process step (5) of lead treated steel provided by the present invention with bright annealing round-robin method be: cold drawn (Φ 6.0mm → Φ 5.7mm) → bright annealing → cold drawn (Φ 5.7mm → Φ 4.6mm → Φ 4.0mm) → bright annealing → cold drawn (Φ 4.0mm → Φ 3.2mm → Φ 2.8mm) → bright annealing → cold drawn (Φ 2.8mm → Φ 2.5mm → Φ 2.3mm).
Bright annealing is to make wire surface light, eliminates work hardening and increases surface toughness, being beneficial to cold drawn processing.
The processing technology of steel wire rod provided by the present invention can obtain has excellent surface quality as material internal flawless, shrinkage cavity, defect and the uniform finished wire rod of performance such as loose, reduce pollution on the environment in production process simultaneously, meet and produce and processing needs, meet or exceed the quality of similar import wire rod.
Detailed description of the invention
For ease of understanding the present invention, it is as follows that the present invention enumerates embodiment.Those skilled in the art should understand, described embodiment only understands the present invention for helping, and should not be considered as concrete restriction of the present invention.
Before the cold drawn processing of the present invention, the composition of steel wire rod used is as following table 1.Embodiments of the invention 1,2,3 are process raw material to carry out cold drawn processing with the 1# steel in table 1,2# steel, 3# steel respectively.
Table 1
| Element % | C | Si | Mn | P | S | Cr | Mo | Pb | Te |
| 1# steel | 0.03 | 0.86 | 1.65 | ＜0.03 | 0.260 | 21.07 | 2.45 | 0.28 | 0.05 |
| 2# steel | 0.04 | 0.82 | 1.74 | ＜0.03 | 0.257 | 21.11 | 2.35 | 0.30 | 0.06 |
| 3# steel | 0.02 | 0.81 | 1.56 | ＜0.03 | 0.265 | 21.24 | 2.39 | 0.25 | 0.04 |
Embodiment 1
The cold drawing process step of lead treated steel provided by the present invention is as follows:
(1) forge: according to intermediate frequency furnace steel ingot forging regulation, resmelting ingot is forged into the steel ingot of 50mm × 50mm × L;
(2) hot rolling: heating, hot rolling, batches, cooling; Technological process is: roll → pre-the finish rolling of 280 milling train (rolling a water-cooled) → crop end → 250 milling train finish rolling (rolling a water-cooled) → 210 rod-rolling mills → lopping → water-cooled of weaving silk in stokehold material loading → heating steel billet → 460 milling train roughing → crop end → 350 milling train;
Wherein hot rolling adopts pusher to push heating furnace heating, and heating-up temperature is 1220 DEG C, start rolling temperature 1100 DEG C, weave silk after being rolled into Φ 6.5mm dimension wire lopping, laying temperature 900 DEG C, then carries out water-cooled, collection reel circle wire rod, defective part sub-cut is clean end to end, checks surface;
(3) anneal: adopt industrial energy saving resistance furnace, heating-up temperature is 800 DEG C, be chilled to less than 500 DEG C stoves after insulation 4h cold;
(4) align, cold rolling sizing and stripping off the skin: adopting oblique Two-roll straightening cutting machine to align after stainless steel annealing, and shear scale, sizing, then strip off the skin, vertical bar being carried out to being welded into Kinds of Heavy Coil, rolling;
Wherein scale, sizing are the vertical bar of Φ 6.5mm × 2000mm, strip off the skin to carry out on XF-WXC type whirlwind Centreless lathe, and cutting depth is 0.25mm, and after stripping off the skin, diameter is Φ 6.0mm; .
(5) cold drawn and bright annealing: carry out cold drawn on LW560 type wire drawing machine, the diameter after wire drawing is controlled by wire drawing die, adopt 7 passes of drawing, bright annealing temperature is 800 DEG C, insulation 2h, cold drawn circulation with bright annealing is carried out, i.e. cold drawn (Φ 6.0mm → Φ 5.7mm) → bright annealing → cold drawn (Φ 5.7mm → Φ 4.6mm → Φ 4.0mm) → bright annealing → cold drawn (Φ 4.0mm → Φ 3.2mm → Φ 2.8mm) → bright annealing → cold drawn (Φ 2.8mm → Φ 2.5mm → Φ 2.3mm).
Embodiment 2
The cold drawing process step of lead treated steel provided by the present invention is as follows:
(1) forge: according to intermediate frequency furnace steel ingot forging regulation, resmelting ingot is forged into the steel ingot of 50mm × 50mm × L;
(2) hot rolling: heating, hot rolling, batches, cooling; Technological process is: roll → pre-the finish rolling of 280 milling train (rolling a water-cooled) → crop end → 250 milling train finish rolling (rolling a water-cooled) → 210 rod-rolling mills → lopping → water-cooled of weaving silk in stokehold material loading → heating steel billet → 460 milling train roughing → crop end → 350 milling train;
Wherein hot rolling adopts pusher to push heating furnace heating, and heating-up temperature is 1250 DEG C, start rolling temperature (1120 DEG C, weave silk after being rolled into Φ 6.5mm dimension wire lopping, laying temperature 920 DEG C, then carries out water-cooled, collection reel circle wire rod, defective part sub-cut is clean end to end, checks surface;
(3) anneal: adopt industrial energy saving resistance furnace, heating-up temperature is 900 DEG C, be chilled to less than 500 DEG C stoves after insulation 3h cold;
(4) align, cold rolling sizing and stripping off the skin: adopting oblique Two-roll straightening cutting machine to align after stainless steel annealing, and shear scale, sizing, then strip off the skin, vertical bar being carried out to being welded into Kinds of Heavy Coil, rolling;
Wherein scale, sizing are the vertical bar of Φ 6.5mm × 2000mm, strip off the skin to carry out on XF-WXC type whirlwind Centreless lathe, and cutting depth is 0.25mm, and after stripping off the skin, diameter is Φ 6.0mm; .
(5) cold drawn and bright annealing: carry out cold drawn on LW560 type wire drawing machine, the diameter after wire drawing is controlled by wire drawing die, adopt 7 passes of drawing, bright annealing temperature is 850 DEG C, insulation 0.5h, cold drawn circulation with bright annealing is carried out, i.e. cold drawn (Φ 6.0mm → Φ 5.7mm) → bright annealing → cold drawn (Φ 5.7mm → Φ 4.6mm → Φ 4.0mm) → bright annealing → cold drawn (Φ 4.0mm → Φ 3.2mm → Φ 2.8mm) → bright annealing → cold drawn (Φ 2.8mm → Φ 2.5mm → Φ 2.3mm).
Embodiment 3
The cold drawing process step of lead treated steel provided by the present invention is as follows:
(1) forge: according to intermediate frequency furnace steel ingot forging regulation, resmelting ingot is forged into the steel ingot of 50mm × 50mm × L;
(2) hot rolling: heating, hot rolling, batches, cooling; Technological process is: roll → pre-the finish rolling of 280 milling train (rolling a water-cooled) → crop end → 250 milling train finish rolling (rolling a water-cooled) → 210 rod-rolling mills → lopping → water-cooled of weaving silk in stokehold material loading → heating steel billet → 460 milling train roughing → crop end → 350 milling train;
Wherein hot rolling adopts pusher to push heating furnace heating, and heating-up temperature is 1240 DEG C, start rolling temperature (1080 DEG C, weave silk after being rolled into Φ 6.5mm dimension wire lopping, laying temperature 880 DEG C, then carries out water-cooled, collection reel circle wire rod, defective part sub-cut is clean end to end, checks surface;
(3) anneal: adopt industrial energy saving resistance furnace, heating-up temperature is 850 DEG C, be chilled to less than 500 DEG C stoves after insulation 5h cold;
(4) align, cold rolling sizing and stripping off the skin: adopting oblique Two-roll straightening cutting machine to align after stainless steel annealing, and shear scale, sizing, then strip off the skin, vertical bar being carried out to being welded into Kinds of Heavy Coil, rolling;
Wherein scale, sizing are the vertical bar of Φ 6.5mm × 2000mm, strip off the skin to carry out on XF-WXC type whirlwind Centreless lathe, and cutting depth is 0.25mm, and after stripping off the skin, diameter is Φ 6.0mm; .
(5) cold drawn and bright annealing: carry out cold drawn on LW560 type wire drawing machine, the diameter after wire drawing is controlled by wire drawing die, adopt 7 passes of drawing, bright annealing temperature is 900 DEG C, insulation 1h, cold drawn circulation with bright annealing is carried out, i.e. cold drawn (Φ 6.0mm → Φ 5.7mm) → bright annealing → cold drawn (Φ 5.7mm → Φ 4.6mm → Φ 4.0mm) → bright annealing → cold drawn (Φ 4.0mm → Φ 3.2mm → Φ 2.8mm) → bright annealing → cold drawn (Φ 2.8mm → Φ 2.5mm → Φ 2.3mm).
The embodiment of the present invention 1,2,3 products obtained therefrom is carried out the test of tensile strength, elongation after fracture, the contraction percentage of area.Test result is in table 2
Table 2
Product observed under electronic scanner microscope the inner flawless of products obtained therefrom, shrinkage cavity simultaneously, loosen.
The cold drawn converted products obtained by the present invention as can be seen from Table 1 has good tensile strength, excellent elongation after fracture and the contraction percentage of area.Scanning micrograph results shows that the converted products of gained of the present invention has excellent surface quality as material internal flawless, shrinkage cavity, defect and the uniform finished wire rod of performance such as loose, also can find out that method of the present invention reduces pollution on the environment production process simultaneously from process of the present invention.
Applicant states, the present invention illustrates detailed process equipment and process flow process of the present invention by above-described embodiment, but the present invention is not limited to above-mentioned detailed process equipment and process flow process, namely do not mean that the present invention must rely on above-mentioned detailed process equipment and process flow process and could implement.Person of ordinary skill in the field should understand, any improvement in the present invention, to equivalence replacement and the interpolation of auxiliary element, the concrete way choice etc. of each raw material of product of the present invention, all drops within protection scope of the present invention and open scope.
Claims (8)
1. a cold drawing process for lead treated steel, comprises the steps:
(1) forge: according to intermediate frequency furnace steel ingot forging regulation, resmelting ingot is forged into steel ingot;
(2) hot rolling: heating, hot rolling, batches, cooling;
(3) anneal: adopt industrial energy saving resistance furnace, heating-up temperature is 800 ~ 900 DEG C, preferably 850 DEG C, insulation 3 ~ 5h, is chilled to less than 500 DEG C stoves cold after preferred 4h;
(4) align, cold rolling sizing and stripping off the skin: adopting oblique Two-roll straightening cutting machine to align after stainless steel annealing, and shear scale, sizing, then strip off the skin, vertical bar being carried out to being welded into Kinds of Heavy Coil, rolling;
(5) cold drawn and bright annealing: carry out cold drawn on wire drawing machine, the diameter after wire drawing is controlled by wire drawing die, bright annealing temperature is 800 ~ 900 DEG C, preferably 850 DEG C, insulation 0.5 ~ 2h, cold drawn circulation with bright annealing is carried out, i.e. cold drawn → bright annealing → cold drawn → bright annealing → cold drawn → bright annealing → cold drawn.
2. smelting process as claimed in claim 1, is characterized in that, in step (1), steel ingot specification is 50mm × 50mm × L;
Preferably, by steel ingot excision end to end.
3. smelting process as claimed in claim 1, it is characterized in that, the technological process of step (2) is: roll → pre-the finish rolling of 280 milling train (rolling a water-cooled) → crop end → 250 milling train finish rolling (rolling a water-cooled) → 210 rod-rolling mills → lopping → water-cooled of weaving silk in stokehold material loading → heating steel billet → 460 milling train roughing → crop end → 350 milling train.
4. smelting process as claimed in claim 1, it is characterized in that, in step (2), hot rolling adopts pusher to push heating furnace heating, and heating-up temperature is 1220 ~ 1250 DEG C, start rolling temperature (1100 ± 20) DEG C, to weave silk after being rolled into Φ 6.5mm dimension wire lopping, laying temperature (900 ± 20) DEG C, then carries out water-cooled, collection reel circle wire rod, defective part sub-cut is clean end to end, checks surface.
5. smelting process as claimed in claim 1, is characterized in that, scale in step (4), sizing are the vertical bar of Φ 6.5mm × 2000mm, strips off the skin to carry out on XF-WXC type whirlwind Centreless lathe, and cutting depth is 0.25mm, and after stripping off the skin, diameter is Φ 6.0mm.
6. smelting process as claimed in claim 1, is characterized in that, cold drawnly in step (5) carries out on high speed wiredrawing bench, preferred LW560 type high speed wiredrawing bench.
7. smelting process as claimed in claim 1, it is characterized in that, cold drawn in step (5) is 7 passes of drawing.
8. smelting process as claimed in claim 1, it is characterized in that, cold drawnly in step (5) with bright annealing round-robin method be: cold drawn (Φ 6.0mm → Φ 5.7mm) → bright annealing → cold drawn (Φ 5.7mm → Φ 4.6mm → Φ 4.0mm) → bright annealing → cold drawn (Φ 4.0mm → Φ 3.2mm → Φ 2.8mm) → bright annealing → cold drawn (Φ 2.8mm → Φ 2.5mm → Φ 2.3mm).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310294104.3A CN104275575A (en) | 2013-07-12 | 2013-07-12 | Cold-drawing machining process for lead-containing free-cutting steel wire rods |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310294104.3A CN104275575A (en) | 2013-07-12 | 2013-07-12 | Cold-drawing machining process for lead-containing free-cutting steel wire rods |
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| CN104275575A true CN104275575A (en) | 2015-01-14 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106216623A (en) * | 2016-08-31 | 2016-12-14 | 广东科莱博科技有限公司 | The process equipment of a kind of sizing milling skin and processing method |
| CN114029355A (en) * | 2021-11-09 | 2022-02-11 | 江苏省福达特种钢有限公司 | Preparation method of high-speed steel for drill bit cutter |
-
2013
- 2013-07-12 CN CN201310294104.3A patent/CN104275575A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106216623A (en) * | 2016-08-31 | 2016-12-14 | 广东科莱博科技有限公司 | The process equipment of a kind of sizing milling skin and processing method |
| CN114029355A (en) * | 2021-11-09 | 2022-02-11 | 江苏省福达特种钢有限公司 | Preparation method of high-speed steel for drill bit cutter |
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Application publication date: 20150114 |