CN105154647B - Production process of piston rod wire rod for vehicle - Google Patents
Production process of piston rod wire rod for vehicle Download PDFInfo
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- CN105154647B CN105154647B CN201510561588.2A CN201510561588A CN105154647B CN 105154647 B CN105154647 B CN 105154647B CN 201510561588 A CN201510561588 A CN 201510561588A CN 105154647 B CN105154647 B CN 105154647B
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Abstract
The invention discloses a production process of a piston rod wire rod for a vehicle. The production process comprises the following steps: the temperature of a heating furnace is controlled within 960-1000 DEG C; the temperature of steel before rolling is within 900-920 DEG C; the surface of a finished product is not completely decarburized, and the local decarburization is not more than 0.1 mm; a forced cooling device is externally added to reduce the rolling deformation heat, so that a material is lower in rolling temperature in final rolling, and the influence on the mechanical performance of the material due to excessive growth of grains in final rolling is prevented; finally, the cooling is performed with a flow not more than 200 L/min after rolling; and the soaking time is given after cooling to guarantee the structure uniformity of the material from center to surface as far as possible. Soft 45# steel is used; and a two-fire blooming rolling process is used for controlling the blank component uniformity and the decarburization layer depth to guarantee the surface quality and the size precision of the material and to enable the material to have excellent fatigue life in the cold bend test process. The production process is suitable for manufacturing the material for a vehicle damper piston rod.
Description
Technical field
The present invention relates to a kind of for drawing, the gren rod of grinding, specifically a kind of vehicle piston bar wire rod
Production technology.
Background technology
Through the PROCESS FOR TREATMENT such as dephosphorization, drawing, grinding post-processing into corresponding bar class steel, material to be carried out before processing
The indices such as case hardness, cold-bending property, fatigue strength are detected.If decarburization is heavier, and material surface hardness and tired can be caused
Labor performance is applicable periodic straight lines and declines, while organizing, grain size control is uneven, it is larger to not only result in strength fluctuation, more fatal
Cause the cold-bending property of material and usage cycles all unqualified.Therefore, heating and the rolling Technology Optimization material of material are improved
The performance that institutional framework and distribution improve material has important practical meaning.The crystalline substance of material can be caused using normal technique
Granularity is relatively low and skewness (the tissue grain size difference of edge and centre is very big), and the finished product for directly affecting downstream client makes
With life-span and performance, the more image to user brings invisible loss.
The content of the invention
For make daming piston bar steel cleavage fracture in clod wash, fatigue period not enough etc. defect, mesh of the invention
Be to provide a kind of production technology of vehicle piston bar wire rod, the production technology can improve material structure grain size and crystal grain point
Cloth (is distributed in edge with the grain size at center up to more than 8.5 grades), mitigates finished surface decarburization (decarburized layer deepness≤0.1mm),
So as to meet the property indices of Downstream processing.
The purpose of the present invention is achieved through the following technical solutions：
A kind of production technology of vehicle piston bar wire rod, it is characterised in that：The production technology is by two fiery coggings, low temperature
Rolling, low temperature finish to gauge, it is long when soaking, quick effective control materials microstructure grain size uniformity and the decarburization layer depth of cooling
Degree, the C content of the vehicle piston bar wire rod is in 0.42%-0.48%；Comprise the following steps：
1) at 980 DEG C, tapping temperature is controlled between 900-920 for furnace temperature of heating furnace control, reduces blank decarburization and corner
Burning；
2) 5.5m/s is reduced to by reinforcement water-cooling device and mill speed outside intermediate mill, it is ensured that rolled piece passes through finish to gauge
Rolling temperature≤900 DEG C during unit；
3) by 40-50 meters of equal heat channel soaking, it is ensured that the temperature batched between 850-870 DEG C, optimal reel
Control is at 865 DEG C.
The present invention using controlling of production process measures such as low-temperature heat, zerolling, long-time sammings by being improved into
The tissue grain size and decarburized layer deepness of product.This production technology is applied to C content in 0.42%-0.48% common steel wire rods.
Present invention control tissue crystal grain rank, uniformity, and the depth critical process of decarburized layer are as follows：
1st, decarburized layer deepness control
Hot stove closes the burner of part heating zone by adjusting electric flow valve, Control for Kiln Temperature at 980 DEG C, tapping temperature
Degree control reduces blank decarburization and corner burning between 900-920, it is ensured that finished product decarburized layer is no more than 0.1mm.
2nd, tissue grain size number, uniformity controlling
By strengthening water-cooling device outside intermediate mill and leading value being reduced to 5.5m/s, it is ensured that rolled piece passes through 16# ends
Rolling temperature≤900 DEG C during milling train group.It is with reference to mark that must not have black line no more than 200L/min and wire rod surface with flow
Standard, will ensure that the temperature batched can be reached between 850-870 DEG C in long-time soaking, and time-temperature is controlled on 865 DEG C of left sides
It is right.
The beneficial effects of the present invention are：The heating technique of this kind of material is optimized, Decarburization Control level is improved；Improve
Material structure grain size number, artificial controls crystal grain distribution uniformity；Meet client use this kind of material stability and
Long periodicity.
The present invention is controlled blank composition uniformity and is taken off using the soft 45# steel of matter by two fiery split rolling method techniques
Carbon-coating depth, it is ensured that material surface quality, dimensional accuracy and during cold bending test have good fatigue life.This hair
It is bright suitable for make piston lever of reducer for automobile material.
Specific embodiment
Embodiment 1
A kind of production technology of vehicle piston bar wire rod, by two fiery coggings, zerolling, low temperature finish to gauge, it is long when it is equal
Heat, quick effective control materials microstructure grain size uniformity and the decarburized layer deepness of cooling, the C of vehicle piston bar wire rod
Content is in 0.42%-0.48%.Table 1 show a kind of controlling of production process scheme of automobile wire rod in embodiment 1.Keep
Less than 900 DEG C of finishing temperature and 860 DEG C of coiling temperature, and heat furnace temperature and be lowered to 980 DEG C, dephosphorization by original 1100 DEG C
Steel temperature afterwards is lowered to 905 DEG C by original 1000 DEG C.Practical decarburized depth before and after experiment such as is listed in table 2, it is de- after cooling
Carbon-coating depth is 80.94 μm, and before cooling is 203.62 μm.
Table 1
| Process program | Furnace temperature (DEG C) | Steel temperature (DEG C) |
| Former technique | 1100 | 1000 |
| Control technique of the invention | 980 | 905 |
Table 2
| Process program | Decarburized layer deepness (μm) |
| Former technique | 203.62 |
| Control technique of the invention | 80.94 |
Embodiment 2
It is as shown in table 3 a kind of vehicle piston bar wire rod production technology in embodiment 2, in control technique is kept
During heating-up temperature, finishing temperature is lowered to 900 DEG C by original 980 DEG C, water tank is opened same by original 4#, 5#, 6# water tank
The situation of Shi Kaiqi makes 4# water tanks into and opens 1/3 aperture, and to be 200L/min as reference with reference to water-carrying capacity, 5# and 6# water tanks are all closed
Close, coiling temperature brings up to 860 DEG C by original 820 DEG C.
As listed the contrast before and after test technology in table 4, performed by control technique the chill that does not note abnormalities and
Edge is consistent distribution uniform up to 8.5 grades substantially with the grain size of center portion.
Table 3
| Process program | Finishing temperature (DEG C) | Water tank is opened | Coiling temperature (DEG C) |
| Former technique | 980 | 4#, 5#, 6# water tank standard-sized sheet | 820 |
| Control technique | 900 | It is fully closed that 4# drives 1/3,5#, 6# water tank | 860 |
Table 4
| Process program | Grain size number | Whether there is chill |
| Former technique | 8 | Have |
| Control technique | 8.5 | Have no |
Claims (4)
1. a kind of production technology of vehicle piston bar wire rod, it is characterised in that：The production technology is rolled by two fiery coggings, low temperature
System, low temperature finish to gauge, it is long when soaking, quick effective control materials microstructure grain size uniformity and the decarburized layer deepness of cooling,
The C content of the vehicle piston bar wire rod is in 0.42%-0.48%；Comprise the following steps：
1）At 980 DEG C, tapping temperature is controlled between 900-920 DEG C for furnace temperature of heating furnace control, reduces blank decarburization and corner mistake
Burn；
2）5.5m/s is reduced to by reinforcement water-cooling device and mill speed outside intermediate mill, it is ensured that rolled piece passes through finish to gauge unit
When rolling temperature≤900 DEG C；
3）By 40-50 meters of equal heat channel soaking, it is ensured that the temperature batched is between 850-870 DEG C.
2. the production technology of vehicle piston bar wire rod according to claim 1, it is characterised in that：Step 2）In, cooling
Water-carrying capacity is no more than 200L/min, and wire rod surface must not have black line.
3. the production technology of vehicle piston bar wire rod according to claim 1, it is characterised in that：Finished product detection edge with
Core structure will have same or like grain size.
4. the production technology of vehicle piston bar wire rod according to claim 1, it is characterised in that：Step 2）In, rolled piece
Rolling temperature during by finish to gauge unit is 865 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510561588.2A CN105154647B (en) | 2015-09-06 | 2015-09-06 | Production process of piston rod wire rod for vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510561588.2A CN105154647B (en) | 2015-09-06 | 2015-09-06 | Production process of piston rod wire rod for vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105154647A CN105154647A (en) | 2015-12-16 |
| CN105154647B true CN105154647B (en) | 2017-05-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510561588.2A Active CN105154647B (en) | 2015-09-06 | 2015-09-06 | Production process of piston rod wire rod for vehicle |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106282788A (en) * | 2016-08-10 | 2017-01-04 | 邢台钢铁有限责任公司 | A kind of piston rod wire rod and production method thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101905245B (en) * | 2010-07-12 | 2012-02-08 | 武汉钢铁(集团)公司 | Ultra-clean low-carbon low-silicon steel wire rod controlled rolling process |
| CN103305675B (en) * | 2013-06-13 | 2015-02-18 | 攀钢集团成都钢钒有限公司 | Method for controlling surface decarburized layer of hot-finished rod for steel cord |
| CN104109745A (en) * | 2014-06-16 | 2014-10-22 | 河北钢铁股份有限公司邯郸分公司 | Rolling process of tire cord steel wire rod |
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