CN115418451A - Process method for improving normalizing bending of round steel for automobile - Google Patents
Process method for improving normalizing bending of round steel for automobile Download PDFInfo
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- CN115418451A CN115418451A CN202211045343.0A CN202211045343A CN115418451A CN 115418451 A CN115418451 A CN 115418451A CN 202211045343 A CN202211045343 A CN 202211045343A CN 115418451 A CN115418451 A CN 115418451A
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- China
- Prior art keywords
- round steel
- process method
- heat treatment
- normalizing
- bending
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
Abstract
The invention discloses a process method for improving normalizing bending of round steel for automobiles, which comprises the following steps that when the round steel is arranged on a continuous heat treatment furnace, firstly, the round steel is paved on a material loading rack in a single layer, and meanwhile, the distance between every two batches of materials is moved forwards through material distribution, so that the distance between every two batches of materials is 250 +/-5 mm; the bar stock put into the continuous heat treatment furnace sequentially passes through the processes of heating, temperature preservation and cooling at the set process speed of 23 +/-0.5 m/h of the roller speed to reach an outlet part; the roller speed of the continuous heat treatment furnace is set to be 23 +/-0.5 m/h, the heat preservation temperature is controlled to be 720 +/-5 ℃, and the fan frequency of the quick cooling section is 750 +/-1 rpm. According to the invention, through the improvement of the material distribution mode and the heat treatment process parameters, the bending degree of the 40Cr round steel after being subjected to normalizing in the continuous heat treatment furnace is obviously improved, the bending degree of the discharged round steel is controlled within 4 per mill, pre-straightening is not required, two-roller fine straightening is directly carried out, the pre-straightening process is omitted, and the processing cost is reduced.
Description
Technical Field
The invention relates to a process method for improving normalizing bending of round steel for automobiles, in particular to a process method for improving normalizing bending of round steel for automobiles.
Background
The normalizing process is carried out on the 40Cr round steel in the continuous heat treatment furnace, the material is distributed in a single layer, the distance between every two adjacent layers of materials is 650mm, the heat preservation temperature is 820 ℃, the frequency of a fan is 888rpm, the temperature is high, the cooling capacity is too strong, the wind direction of the fan is the middle part of every two adjacent layers of materials, the radian is bent, and the hook head is bent due to the fact that the distance between the end parts is large and the cooling is uneven. The bending degree is more than 6 per mill, the local part reaches more than 10 per mill, and the requirement of direct two-roller fine correction cannot be met in the subsequent processing (the bending degree is less than 4 per mill).
Therefore, it is desired to solve the above problems.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a process method for improving the normalizing bending of round steel for automobiles without pre-straightening.
The technical scheme is as follows: in order to achieve the purpose, the invention discloses a process method for improving the normalizing bending of round steel for automobiles, which comprises the following steps:
when the round steel is on the continuous heat treatment furnace, firstly, the round steel is paved on a material loading rack in a single layer, and meanwhile, the distance between every two batches of materials is moved forwards through material distribution, so that the distance between every two batches of materials is 250 +/-5 mm; the bar stock put into the continuous heat treatment furnace sequentially passes through the processes of heating, temperature preservation and cooling at the set process speed of 23 +/-0.5 m/h of the roller speed to reach an outlet part; the roller speed of the continuous heat treatment furnace is set to be 23 +/-0.5 m/h, the heat preservation temperature is controlled to be 720 +/-5 ℃, and the fan frequency of the quick cooling section is 750 +/-1 rpm.
Wherein the ends of each batch are aligned and the difference between the ends of each batch is no more than 5mm.
Preferably, after the bars are unpacked, the bars are placed on a material distribution rack through a travelling crane, material distribution is carried out according to requirements, steel is paved on a single layer, long materials are arranged below, and short materials are arranged above.
And raising the transverse conveying mechanism from the lower part of the material distributing rack, supporting the rows of the bar materials above the material distributing rack, transversely conveying the bar materials to an inlet roller table of the continuous heat treatment furnace, placing the bar materials on the roller surface of the continuous heat treatment furnace, and returning the transverse conveying mechanism to the lower part of the material distributing rack to prepare for distributing materials again.
Further, when the material tail of the previous batch leaves and detects the grating A, the steel bar is conveyed to the front of the inlet sealing chamber by the inlet roller table, the steel bar is detected by the grating B, the process speed is set to be 23 +/-0.5 m/h and enters the sealing chamber at the same speed as the continuous heat treatment furnace, the specified interval is kept to be 250 +/-5 mm with the previous batch, and when the material tail of the batch leaves the grating A, the material tracking of the rod in the furnace is started, and the rod is conveyed into the furnace.
Preferably, the operation time in the heat preservation period is 1.8 +/-0.2 h.
Furthermore, the total length of the rapid cooling section is 5m.
Further, when the tail of the bar material leaves the grating C of the slow cooling section, the driving ring at the rear part of the slow cooling section and the driving ring of the outlet roller table synchronously and quickly drive the bar material to be discharged out of the furnace until the tail of the bar material leaves the grating D, the bar material discharged out of the furnace is lifted from the discharging roller table by the transverse conveying device, transversely conveyed to the material collecting rack and slowly placed on the material collecting rack, and the heat treatment process is finished.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: according to the invention, through the improvement of the material distribution mode and the heat treatment process parameters, the bending degree of the 40Cr round steel after being subjected to normalizing in the continuous heat treatment furnace is obviously improved, the bending degree after being discharged from the furnace is controlled within 4 per mill, pre-straightening is not required, two-roller fine straightening is directly carried out, the pre-straightening process is omitted, and the processing cost is reduced.
Detailed Description
The technical solution of the present invention is further explained below.
The invention relates to a process method for improving normalizing bending of round steel for automobiles, which comprises the following steps:
when the round steel is on the continuous heat treatment furnace, firstly, the round steel is spread on a material loading rack in a single-layer mode, meanwhile, the distance between every two batches of materials is moved forwards through material distribution, the distance between every two batches of materials is enabled to be 250 +/-5 mm, the ends of every two batches of materials are aligned, and the difference between the ends of every two batches of materials is not more than 5mm; the roller speed of the continuous heat treatment furnace is set to be 23 +/-0.5 m/h, the heat preservation temperature is controlled to be 720 +/-5 ℃, and the fan frequency of the quick cooling section is 750 +/-1 rpm.
And after the bars are unpacked, the bars are placed on a material distribution rack through a travelling crane, material distribution is carried out according to requirements, and steel is paved in a single layer. When the material is spread, the bars are strictly forbidden to be crossed, the long material is below, and the short material is above, so that the bending degree of the steel after heat treatment is reduced. The transverse conveying mechanism is lifted from the lower part of the material distributing rack, rows of bar materials above the rack are lifted, the bar materials are transversely conveyed to the inlet roller platform, the bar materials are stably and slowly placed on the roller surface, the transverse conveying mechanism returns to the lower part of the material distributing rack to prepare for material distribution again, meanwhile, the distance between every two batches of the bar materials is moved forwards through material distribution, the distance between every two batches of the bar materials is 250 +/-5 mm, the ends of every two batches of the bar materials are aligned, the difference between the ends of every two batches of the bar materials is not more than 5mm, and steel conveying action is repeated.
When the material tail of the previous batch leaves the grating for detecting the number a, the inlet roller table rapidly operates to convey the steel rod to the front of the inlet sealing chamber, the grating for detecting the number b changes the roller speed to be the same as that of the furnace to set the process speed to be 23 +/-0.5 m/h, the steel rod enters the sealing chamber, the specified interval with the previous batch is kept to be 250 +/-5 mm, and when the material tail of the batch leaves the grating for detecting the number a, the material tracking of the rod in the furnace is started, and the rod is conveyed into the furnace. The bar stock loaded into the furnace sequentially passes through the processes of heating, temperature rise, heat preservation and cooling at the set process speed of 23 +/-0.5 m/h of the roller speed to reach an outlet part. When the heat preservation section is passed, the heat preservation temperature is controlled to be 720 +/-5 ℃, the process speed is 23 +/-0.5 m/h, and the heat preservation section is operated for 1.8 +/-0.2 h. Then entering a fast cooling section, setting the fan frequency at 750 +/-1 rpm in the fast cooling section and setting the total length of the fast cooling section to be 5m.
When the tail of the bar material leaves the grating C of the slow cooling section, the driving ring at the rear part of the slow cooling section and the driving ring of the outlet roller table synchronously and quickly drive the bar material to be discharged out of the furnace until the tail of the bar material leaves the grating D, the bar material discharged out of the furnace is lifted from the discharging roller table by the transverse conveying device, transversely conveyed to the material collecting rack and slowly placed on the material collecting rack, and the heat treatment process is finished.
The invention relates to a process method for improving normalizing bending of round steel for automobiles, which is mainly suitable for process arrangement of the round steel on a continuous heat treatment furnace, wherein the round steel is paved with steel on a feeding rack in a single layer manner to ensure thorough heating in the continuous heat treatment furnace, and meanwhile, the distance between every two batches of materials is moved forwards through distribution, so that the distance between every two batches of materials is 250 +/-5 mm, the ends of every two batches of materials are aligned, and the difference between the ends of every two batches of materials is not more than 5mm, so that the ends are uniformly heated and cooled; before the improvement of the process is implemented, the bending degree of the round steel discharged from the furnace is 5 per mill, in 5 months in 2021, the bending degree of the round steel discharged from the furnace is 4.5 per mill through the interval control and end alignment of each batch of the experimental 10 tons and 40 Cr.
Secondly, ensuring that the roller speed of the continuous heat treatment furnace is set at 23 +/-0.5 m/h; before the improvement of the process is implemented, the bending degree of the round steel discharged from the furnace is 5 per mill, 10 months in 2021, 12 tons in experiment and 40Cr, the speed of the roller is set at 23m/h, and the bending degree of the round steel discharged from the furnace is 4.8 per mill.
And the heat preservation temperature is controlled to be 720 +/-5 ℃. Meanwhile, the fan frequency of the fast cooling section is 750 +/-1 rpm. To ensure that the cooling rate cannot be too fast to cause bowing due to uneven cooling. Before the improvement of the process is implemented, the bending degree of the round steel discharged from the furnace is 5 per mill. In 1 month in 2022, experiment shows that 13 tons of 40Cr are produced, the heat preservation temperature is controlled to be 720 +/-5 ℃, the frequency of a fan in a quick cooling section is 750rpm, and the bending degree of the round steel discharged from a furnace is 4.3 per thousand.
In the experiment of 15 tons in the 2 nd month of 2022, the distance between every two batches is 250mm, the ends of every two batches are aligned, the difference between every two batches is not more than 5mm, the roller speed is set at 23m/h, the heat preservation temperature is controlled at 720 +/-5 ℃, the fan frequency of a quick cooling section is 750rpm, and the bending degree of round steel discharged from a furnace is 2.5 per thousand.
Claims (8)
1. A process method for improving normalizing bending of round steel for automobiles is characterized by comprising the following steps:
when the round steel is on the continuous heat treatment furnace, firstly, the round steel is paved on a material loading rack in a single layer, and meanwhile, the distance between every two batches of materials is moved forwards through material distribution, so that the distance between every two batches of materials is 250 +/-5 mm; the bar stock put into the continuous heat treatment furnace sequentially passes through the processes of heating, temperature preservation and cooling at the set process speed of 23 +/-0.5 m/h of the roller speed to reach an outlet part; the roller speed of the continuous heat treatment furnace is set to be 23 +/-0.5 m/h, the heat preservation temperature is controlled to be 720 +/-5 ℃, and the fan frequency of the quick cooling section is 750 +/-1 rpm.
2. The process method for improving the normalizing bending of the round steel for the automobile as claimed in claim 1, wherein the process method comprises the following steps: the ends of each batch were aligned and the difference between the ends of each batch did not exceed 5mm.
3. The process method for improving the normalizing bending of the round steel for the automobile as claimed in claim 1, wherein the process method comprises the following steps: after the bars are unpacked, the bars are placed on a material distribution rack through a travelling crane, material distribution is carried out according to requirements, steel is paved on a single layer, long materials are arranged below, and short materials are arranged above.
4. The process method for improving the normalizing bending of the round steel for the automobile as claimed in claim 3, wherein the process method comprises the following steps: and the transverse conveying mechanism is lifted from the lower part of the material distribution rack, supports the rows of the bars above the material distribution rack, transversely conveys the bars to an inlet roller table of the continuous heat treatment furnace, and returns the lower part of the material distribution rack after the bars are placed on the roller surface of the continuous heat treatment furnace to prepare for material distribution again.
5. The process method for improving the normalizing bending of the round steel for the automobile as claimed in claim 1, wherein the process method comprises the following steps: when the material tail of the previous batch leaves and detects the grating of No. a, the steel rod is conveyed to the front of the inlet sealing chamber by the inlet roller table, the steel rod is detected by the grating of No. b, the process speed is set to be 23 +/-0.5 m/h and enters the sealing chamber at the same speed as the continuous heat treatment furnace, the specified distance between the steel rod and the previous batch is kept to be 250 +/-5 mm, and when the material tail of the batch leaves the grating of No. a, the material tracking of the rod in the furnace is started, and the rod is conveyed into the furnace.
6. The process method for improving the normalizing bending of the round steel for the automobile as claimed in claim 1, wherein the process method comprises the following steps: the running time of the heat preservation section is 1.8 +/-0.2 h.
7. The process method for improving the normalizing bending of the round steel for the automobile as claimed in claim 1, wherein the process method comprises the following steps: the total length of the fast cooling section is 5m.
8. The process method for improving the normalizing bending of the round steel for the automobile as claimed in claim 1, wherein the process method comprises the following steps: when the bar material tail leaves the grating C of the slow cooling section, the driving ring at the rear part of the slow cooling section and the driving ring of the outlet roller table synchronously and quickly drive the bar material to be discharged out of the furnace until the bar material tail leaves the grating D, the bar material discharged out of the furnace is lifted from the discharging roller table by the transverse conveying device, transversely conveyed to the material collecting rack and slowly placed on the material collecting rack, and the heat treatment process is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211045343.0A CN115418451A (en) | 2022-08-30 | 2022-08-30 | Process method for improving normalizing bending of round steel for automobile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211045343.0A CN115418451A (en) | 2022-08-30 | 2022-08-30 | Process method for improving normalizing bending of round steel for automobile |
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| Publication Number | Publication Date |
|---|---|
| CN115418451A true CN115418451A (en) | 2022-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211045343.0A Pending CN115418451A (en) | 2022-08-30 | 2022-08-30 | Process method for improving normalizing bending of round steel for automobile |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104962704A (en) * | 2015-06-13 | 2015-10-07 | 秦皇岛首秦金属材料有限公司 | Heat treatment production method through air cooling after normalization |
| CN107557554A (en) * | 2017-09-19 | 2018-01-09 | 南京钢铁股份有限公司 | A kind of normalizing process of automobile shafts class bar roller bottom type annealing furnace |
| CN113930606A (en) * | 2021-10-13 | 2022-01-14 | 南京钢铁股份有限公司 | Normalizing process of steel for automobile transmission shaft parts |
-
2022
- 2022-08-30 CN CN202211045343.0A patent/CN115418451A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104962704A (en) * | 2015-06-13 | 2015-10-07 | 秦皇岛首秦金属材料有限公司 | Heat treatment production method through air cooling after normalization |
| CN107557554A (en) * | 2017-09-19 | 2018-01-09 | 南京钢铁股份有限公司 | A kind of normalizing process of automobile shafts class bar roller bottom type annealing furnace |
| CN113930606A (en) * | 2021-10-13 | 2022-01-14 | 南京钢铁股份有限公司 | Normalizing process of steel for automobile transmission shaft parts |
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