CN114700375A - Production method of track steel - Google Patents
Production method of track steel Download PDFInfo
- Publication number
- CN114700375A CN114700375A CN202210283239.9A CN202210283239A CN114700375A CN 114700375 A CN114700375 A CN 114700375A CN 202210283239 A CN202210283239 A CN 202210283239A CN 114700375 A CN114700375 A CN 114700375A
- Authority
- CN
- China
- Prior art keywords
- finished product
- rolling
- rolled piece
- rolling mill
- descaling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
-
- 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
- B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
- B23P23/04—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass for both machining and other metal-working operations
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Heat Treatment Of Steel (AREA)
- Metal Rolling (AREA)
Abstract
The invention provides a production method of track steel, which comprises the following steps: (a) heating the blank to 1200-1300 ℃, and discharging to obtain a steel billet; (b) sending the steel billet subjected to the first descaling to a first 400 rolling mill for primary rolling to obtain a first rolled piece; (c) sending the first rolled piece to a second 400 rolling mill for finish rolling to obtain a second rolled piece; (d) sending the second rolled piece subjected to secondary descaling to a first phi 250 rolling mill for finish rolling to obtain a third rolled piece; (e) sending the third rolled piece subjected to the third descaling to a second phi 250 rolling mill for rolling forming to obtain a finished product; (f) sawing the rolled finished product into the ordered length by using a hot sawing machine; (g) conveying the sawed finished product to a cooling bed for cooling; (h) and straightening the cooled finished product. Thereby avoiding the generation of large burrs during punching.
Description
Technical Field
The invention relates to a production method of track steel, in particular to a production method of track steel capable of avoiding burrs generated by punching.
Background
The caterpillar is a flexible chain ring which is driven by the driving wheel and surrounds the driving wheel, the loading wheel, the inducer and the riding wheel. The crawler belt consists of a crawler plate, a crawler pin and the like; the track pin connects the track shoes together to form a track link. The crawler belt can be used for traveling of various devices such as an excavator, a tank and the like. With the rapid development of various industries, the demand of various industries on excavators is continuously increased, and the corresponding technical requirements on the track steel are continuously improved so as to meet the comprehensive performance requirements on the track steel such as wear resistance, fatigue life and the like.
The commercial track steel is easy to produce large burrs in the punching process (as shown in fig. 1), so that a user (downstream customer) needs to add a grinding process, which affects the production efficiency and increases the cost. At present, the person skilled in the art still uses "deburring" as a solution to the above problem: the invention patent with application number 202110020192.2 discloses a steel strip punching deburring device, the utility model patent of 201721353268.9 discloses a deburring device for stainless steel component punching process, the Chinese invention patent of 202110847942.3 discloses a punching method for deburring a steel shell, the Chinese invention patent of 202011235850.1 discloses a process method for reducing burr generation rate during punching process of a stainless steel sieve plate; it can be seen that the root cause of the burr is not recognized by those skilled in the art, and thus the technical problem can be solved only by a physical elimination method, and thus the production efficiency is not improved and the cost is not reduced fundamentally.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a production method of track steel for avoiding burrs generated by punching.
In order to achieve the technical purpose, the invention provides a production method of track steel, which comprises the following steps:
(a) heating the blank to 1200-1300 ℃, and discharging to obtain a steel billet;
(b) carrying out primary high-pressure water descaling on the steel billet; sending the steel billet subjected to the first descaling to a first 400 rolling mill for primary rolling to obtain a first rolled piece;
(c) sending the first rolled piece to a second 400 rolling mill for finish rolling to obtain a second rolled piece;
(d) performing secondary high-pressure water descaling on the second rolled piece; sending the second rolled piece subjected to secondary descaling to a first phi 250 rolling mill for finish rolling to obtain a third rolled piece;
(e) carrying out third high-pressure water descaling on the third rolled piece; sending the third rolled piece subjected to the third descaling to a second phi 250 rolling mill for rolling forming to obtain a finished product;
(f) sawing the rolled finished product into the ordered length by using a hot sawing machine;
(g) conveying the sawed finished product to a cooling bed for cooling; cooling is to cool the finished product after sawing by air and then carry out water mist cooling; the air cooling is to cool the steel plate to be less than or equal to 300 ℃ at the speed of 1-1.2 ℃/s on average;
(h) and straightening the cooled finished product.
Preferably, in the step (a), the size of the blank is (120-150) × (120-150) mm 2.
Optimally, in the step (a), the discharging temperature of the blank is 1130-1180 ℃.
Further, in the step (a), the heating time of the blank is 2-3 h.
Optimally, the pressure of the first high-pressure water descaling and the pressure of the second high-pressure water descaling are mutually independent and are 20-25 MPa, and the pressure of the third high-pressure water descaling is 15-18 MPa.
Further, in the step (b), the initial rolling of the first 400 rolling mill is 6-8 passes; in the step (c), the finish rolling of the second 400 rolling mill is performed in 1 pass.
Further, in the step (d), the finish rolling of the first Φ 250 rolling mill is performed in 4 passes; in the step (d), the finish rolling of the second phi 250 rolling mill is performed in 1 pass.
Optimally, in the step (f), the finished product is subjected to red inspection after being sawed into the order length, and the red inspection is to carry out surface quality inspection and size inspection on the finished product by heat.
Further, in the step (g), the cooled product is also inspected to check its surface quality and dimensions of each part.
Further, in the step (h), after straightening, inspection is also performed to check the surface quality and the size of each part of the finished product; packaging the steel according to the specification and the rolling batch number; then, the finished product is cut to length to ensure the end quality and the length to length are accurate; the steel products were marked according to the regulations of classification society, bundled with a packaging tape, and stored.
According to the production method of the track steel, a specific process step is adopted, and a cooling mode (the temperature is reduced to be less than or equal to 300 ℃ by air cooling at the average speed of 1-1.2 ℃/s, and then water mist cooling is carried out), so that a metallographic structure in a finished product is prevented from forming an abnormal bainite structure to form a fine-grained ferrite and pearlite structure (grade 8-8.5) with good shaping, and larger burrs are prevented from being generated during punching; the skilled person will therefore not appreciate that burrs are caused by the presence of a bainite structure in the metallographic structure.
Drawings
FIG. 1 is a punching drawing (with burrs) of a prior caterpillar band steel;
FIG. 2 is a metallographic picture of a coated steel strip in example 1;
FIG. 3 is a metallographic picture of a steel strip track in comparative example 1.
Detailed Description
The following detailed description of preferred embodiments of the invention will be made.
Example 1
The embodiment provides a production method of track steel, which comprises the following steps:
(a) heating the blank (120 multiplied by 120mm 2) to 1200-1300 ℃ and heating for 2-3 h, and discharging to obtain a billet (the discharging temperature is 1130-1180 ℃) (when the heating temperature is 1200-1300 ℃, the heating time is 2-3 h, and the discharging temperature is changed within the range of 1130-1180 ℃, the billet has no influence on the performance of the final product);
(b) carrying out primary high-pressure water descaling on the steel billet (20-25 MPa, wherein the performance of a final product is not influenced in the range); sending the steel billet subjected to the first descaling to a first 400 rolling mill for primary rolling (6-8 passes without influence on the performance of a final product) to obtain a first rolled piece;
(c) sending the first rolled piece to a second 400 rolling mill for finish rolling (1 pass) to obtain a second rolled piece;
(d) performing secondary high-pressure water descaling (20-25 MPa) on the second rolled piece, wherein the performance of a final product is not influenced in the range; sending the second rolled piece subjected to secondary descaling to a first phi 250 rolling mill for finish rolling (4 passes) to obtain a third rolled piece;
(e) carrying out third high-pressure water descaling (15-18 MPa, wherein the performance of a final product is not influenced) on the third rolled piece; sending the third rolled piece subjected to third descaling to a second phi 250 rolling mill for rolling forming (1 pass, the performance of the final product is not influenced in the range) to obtain a finished product;
(f) sawing the rolled finished product into the ordered length by using a hot sawing machine; and then carrying out red detection: carrying out surface quality inspection and size inspection on the finished product by heat;
(g) conveying the sawed finished product to a cooling bed for cooling; the cooling is that the finished product after sawing is firstly cooled by air, then water mist cooling is carried out (the conveying speed of a cooling bed is relatively constant, the temperature is reduced at the average speed of 1-1.2 ℃/s in an air cooling section (the temperature reduction speed section has little influence on the performance of the final product, the same is true below), when the product moves to the area beginning to enter the water mist zone, the temperature is reduced to 260-300 ℃, and then the product is tested to test the surface quality and the sizes of all parts;
(h) straightening the cooled finished product; inspection is also performed to check the surface quality and the dimensions of the various parts of the finished product; packaging the steel according to the specification and the rolling batch number; then, the finished product is cut to length to ensure the end quality and the length to length are accurate; marking the steel according to the regulations of classification society, bundling the steel by using a packaging tape, and warehousing the steel; the metallographic analysis of the product is carried out and the results are shown in fig. 2, in which only ferrite and pearlite and no bainite are present.
Example 2
This example provides a method of producing track steel, which is substantially the same as in example 1, except that: and continuously staying before entering the water mist area to continuously cool to 240-250 ℃, wherein the metallographic phase of the final product only contains ferrite and pearlite.
Comparative example 1
This comparative example provides a method of producing track steel substantially in accordance with example 1, except that: cooling at the speed of 0.6-0.8 ℃/s (the conveying speed of the cooling bed is consistent with that in the embodiment 1, the influence of the cooling speed interval on the performance of the final product is small), and when the product moves to the beginning of entering the water mist area, reducing the temperature to 320-350 ℃/s (the influence of the cooling speed interval on the performance of the final product is small); the gold phase diagram is shown in FIG. 3, and contains ferrite, pearlite and bainite.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. The production method of the track steel is characterized by comprising the following steps of:
(a) heating the blank to 1200-1300 ℃, and discharging to obtain a steel billet;
(b) carrying out primary high-pressure water descaling on the steel billet; sending the steel billet subjected to the first descaling to a first 400 rolling mill for primary rolling to obtain a first rolled piece;
(c) sending the first rolled piece to a second 400 rolling mill for finish rolling to obtain a second rolled piece;
(d) performing secondary high-pressure water descaling on the second rolled piece; sending the second rolled piece after the second descaling to a first phi 250 rolling mill for finish rolling to obtain a third rolled piece;
(e) carrying out third high-pressure water descaling on the third rolled piece; sending the third rolled piece subjected to the third descaling to a second phi 250 rolling mill for rolling forming to obtain a finished product;
(f) sawing the rolled finished product into the ordered length by using a hot sawing machine;
(g) conveying the sawed finished product to a cooling bed for cooling; cooling is to cool the finished product after sawing by air and then carry out water mist cooling; the air cooling is to cool the steel plate to be less than or equal to 300 ℃ at the speed of 1-1.2 ℃/s on average;
(h) and straightening the cooled finished product.
2. A method for producing track steel according to claim 1, wherein: in the step (a), the size of the blank is (120-150) × (120-150) mm 2.
3. A method for producing track steel according to claim 1, wherein: in the step (a), the discharging temperature of the blank is 1130-1180 ℃.
4. A method for producing track steel according to claim 1 or 3, wherein: in the step (a), the heating time of the blank is 2-3 h.
5. A method for producing track steel according to claim 1, wherein: the first high-pressure water descaling and the second high-pressure water descaling are independent of each other and are 20-25 MPa, and the pressure of the third high-pressure water descaling is 15-18 MPa.
6. Method for producing track steel according to claim 1 or 5, characterized in that: in the step (b), the initial rolling of the first 400 rolling mill is 6-8 passes; in the step (c), the finish rolling of the second 400 rolling mill is performed in 1 pass.
7. A method for producing track steel according to claim 6, wherein: in the step (d), the finish rolling of the first phi 250 rolling mill is 4 passes; in the step (d), the finish rolling of the second phi 250 rolling mill is performed in 1 pass.
8. A method for producing track steel according to claim 1, wherein: and (f) performing red inspection after the finished product is sawed into the order length, wherein the red inspection is surface quality inspection and size inspection of the finished product by heat.
9. A method for producing track steel according to claim 8, wherein: in the step (g), the cooled product is also inspected to check the surface quality and the size of each part.
10. A method for producing track steel according to claim 9, wherein: in the step (h), after straightening, checking to check the surface quality and the sizes of all parts of the finished product; packaging the steel according to the specification and the rolling batch number; then, the finished product is cut to length to ensure the end quality and the length to length are accurate; the steel products were marked according to the regulations of classification society, bundled with a packaging tape, and stored.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210283239.9A CN114700375A (en) | 2022-03-22 | 2022-03-22 | Production method of track steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210283239.9A CN114700375A (en) | 2022-03-22 | 2022-03-22 | Production method of track steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114700375A true CN114700375A (en) | 2022-07-05 |
Family
ID=82168668
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210283239.9A Withdrawn CN114700375A (en) | 2022-03-22 | 2022-03-22 | Production method of track steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114700375A (en) |
-
2022
- 2022-03-22 CN CN202210283239.9A patent/CN114700375A/en not_active Withdrawn
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6502486B1 (en) | Method for producing steel rolling bearing rings | |
| CN107321790B (en) | The acid washing method of low-carbon hot-rolling strip | |
| CN105013860B (en) | The control method that a kind of hot-rolling high-strength steel head steady is batched | |
| CN105087881B (en) | 304 stainless steel annealing methods | |
| CN110681698A (en) | 38MnS6L non-quenched and tempered steel rolling process | |
| CN102601597A (en) | Machining process for railway riveting fastener molds | |
| CN109352288A (en) | A kind of automobile gimbal fork single piece cold extrusion compression moulding technique | |
| CN110205460A (en) | A kind of production method preventing the flat volume of low carbon high alloy hot rolled strip | |
| CN102989942A (en) | Forging method of single-throw crank shaft | |
| CN112427590A (en) | Forging process and device for seahorse-shaped forged piece | |
| US5829117A (en) | Hot saw cutting type continuous rolling method and apparatus thereof | |
| CN109055708B (en) | Heat treatment method for weld joint of eutectoid steel rail and hypereutectoid steel rail | |
| CN114700375A (en) | Production method of track steel | |
| CN100423857C (en) | Production facility and method for high-intensity packing steel belt | |
| CN206898700U (en) | A kind of intelligent repairing line of sucker rod | |
| CN110253221A (en) | A method of for connecting rod blank destressing | |
| CN201172689Y (en) | Minor diameter anticrease roller of decoiler | |
| CN114453419B (en) | Production process of ultra-pure ferrite stainless steel cold-rolled base material for EGR of gasoline car | |
| WO1978000015A1 (en) | Ring type calibrating cage | |
| CN2923079Y (en) | Loop laying pipe assembly | |
| CN104353698A (en) | Production technology of high pressure fuel pipe | |
| CN112974519B (en) | Economical welding endless rolled bar production line process arrangement and production method | |
| CN109108531A (en) | Roll overlaying repairs pre-treating method | |
| CN114406000A (en) | Continuous casting and rolling method for common low-carbon steel medium plate | |
| CN114406226A (en) | Continuous casting and rolling method for micro-alloy low-carbon steel medium plate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20220705 |
|
| WW01 | Invention patent application withdrawn after publication |