CN111468669A - Forging method of roller - Google Patents
Forging method of roller Download PDFInfo
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- CN111468669A CN111468669A CN202010454008.0A CN202010454008A CN111468669A CN 111468669 A CN111468669 A CN 111468669A CN 202010454008 A CN202010454008 A CN 202010454008A CN 111468669 A CN111468669 A CN 111468669A
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- steel ingot
- forging
- pressing
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- steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/06—Making machine elements axles or shafts
- B21K1/10—Making machine elements axles or shafts of cylindrical form
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K29/00—Arrangements for heating or cooling during processing
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The application discloses a forging method of a roller, which comprises the following steps: pressing the steel ingot into a cuboid steel ingot, removing a riser and a nozzle, wherein the ratio of the length, the width and the height of the pressed steel ingot is 3: 1.5: 1; extruding the steel ingot from two sides of the length direction of the two sides, flattening the length of the steel ingot into half of the original length, wherein the surface of the steel ingot in the width direction and the surface of the steel ingot in the height direction are both in an arc shape; forging and pressing the steel ingot, and rotating by 90 degrees to continuously forge and press the next surface after forging and pressing one surface each time; and forging and pressing the steel ingot. The invention has the following beneficial effects: only one upsetting process is needed, so that the whole processing time can be reduced, the surface cracking phenomenon can be reduced, the production efficiency can be effectively improved, the production cost can be reduced, and the product quality can be improved.
Description
Technical Field
The invention relates to the field of forging, in particular to a method for forging a roller.
Background
The Cr5 cold roll is widely used in large and medium rolling mills at present, the quality of the roll directly determines the rolling efficiency and the product quality, in order to improve the fatigue resistance and the wear resistance of the material, at present, except for electroslag ingot and power frequency quenching, a low-temperature common forging method is generally adopted in the forging process, the forging method breaks the thick cast structure by upsetting and drawing out, but because the Cr5 cold roll has high carbon content, the Cr content reaches 5 percent, the forgeability is poor, the low-temperature large-deformation forging method needs the forging ratio more than 5 to effectively break the carbide, the forging method needs two times of upsetting and drawing out in actual forging, and the surface cracking phenomenon often occurs and is discarded.
Disclosure of Invention
The invention provides a method for forging a roller, aiming at the problems.
The technical scheme adopted by the invention is as follows:
a forging method of a roller comprises the following steps,
s1 (profiling step): pressing the steel ingot into a cuboid steel ingot, removing a riser and a nozzle, wherein the ratio of the length, the width and the height of the pressed steel ingot is 3: 1.5: 1;
s2 (upsetting step): extruding the steel ingot from two sides of the length direction of the two sides, flattening the length of the steel ingot into half of the original length, wherein the surface of the steel ingot in the width direction and the surface of the steel ingot in the height direction are both in an arc shape;
s3 (forging step): forging and pressing the steel ingot, and rotating by 90 degrees to continuously forge and press the next surface after forging and pressing one surface each time;
s4 (molding step): and forging and pressing the steel ingot.
According to the scheme, only one upsetting process is needed, so that the whole processing time can be reduced, the surface cracking phenomenon can be reduced, the production efficiency can be effectively improved, the production cost is reduced, and the product quality is improved.
Meanwhile, in the scheme, as the surface is forged and pressed after being rotated for 90 degrees for many times, the working area of the roller has small deformation difference, the roller has more uniform tissue, and the service life of the whole roller is prolonged.
Optionally, the temperature of the steel ingot in the profiling step is 1170-1190 ℃.
The initial forging temperature of the process is 1170-1190 ℃, the surface cracking can be avoided, the deformation in fire is large, and the carbide and the cast structure can be effectively broken.
Optionally, the temperature of the steel ingot in the upsetting step is 1220 to 1240 ℃.
Optionally, the temperature of the steel ingot in the molding step is 1140-1160 ℃.
Optionally, the steel ingot is a Cr5 steel ingot.
The invention has the beneficial effects that: only one upsetting process is needed, so that the whole processing time can be reduced, the surface cracking phenomenon can be reduced, the production efficiency can be effectively improved, the production cost can be reduced, and the product quality can be improved.
Description of the drawings:
FIG. 1 is a schematic process flow diagram of example 1;
FIG. 2 is a schematic view of the process flow of the comparative example.
The figures are numbered: 1. the device comprises an anvil, 2, a riser, 3, a water gap, 4, a first deformation area, 5, a second deformation area, 6 and a third deformation area.
The specific implementation mode is as follows:
the present invention will be described in detail below with reference to the accompanying drawings.
Example 1
The whole process is shown in figure 1, and the specific steps are as follows
S1, heating the steel ingot to 1180 ℃, extruding the steel ingot from two sides of the steel ingot by using an anvil, removing a riser 2 and a nozzle 3, wherein the ratio of the length (marked by a letter L), the width (marked by a letter W) and the height (marked by a letter H) of the pressed steel ingot is 3: 1.5: 1;
s2: heating the steel ingot to 1230 ℃, extruding the steel ingot from two sides of the length direction of the two sides, flattening the length of the steel ingot into half of the original length, wherein the surface of the steel ingot in the width direction and the surface of the steel ingot in the height direction are both in an arc shape; the whole process is as shown in a second graph in the attached figure 1, and the shape of the steel ingot after the step is finished is as shown in a third graph in the attached figure 1;
s3: forging and pressing each surface of the steel ingot, turning each surface by 90 degrees and then forging and pressing until the whole steel ingot is forged and pressed into a shape with a regular octagonal section, wherein the whole process is as shown in a fourth drawing in attached figure 1;
s4: and raising the temperature of the steel ingot to 1150 ℃, marking the blank, forging and pressing the blank into a roller, wherein the shape of the roller is shown as the sixth figure of the attached drawing 1.
Comparative example
The comparative example is the method set forth in the background.
S1: preparing a steel ingot, heating the steel ingot to 1180 ℃, and then preparing to forge and press the steel ingot;
s2, pressing the steel ingot by using an anvil 1, removing a riser 2 and a nozzle 3, and drawing the steel ingot on the anvil 1 to form a regular octagonal shape, wherein the ratio of the length (L) to the diameter (D) is approximately equal to 2.2;
s3: keeping the temperature in a furnace at 1180 ℃, erecting a steel ingot, putting a clamp handle into a drain pan, wearing an arc upsetting cap at the tail of the ingot, applying pressure from top to bottom by a press to enable the steel ingot to be approximately spherical, wherein the blank moves to form three areas, namely a first deformation area 4, a second deformation area 5 and a sixth deformation area 6 due to the friction force of an upper tool and a lower tool, the first deformation area 4 and the sixth deformation area 6 are difficult deformation areas, the second deformation area 5 is an easy deformation area, and the steel ingot is mainly deformed in the second deformation area 5 (namely the steel ingot is most prone to crack) according to the law of minimum resistance; this step is shown in the third drawing of FIG. 2, which is also known as upset forging;
s4, re-drawing the blank into a regular octagonal shape according to the original axial direction, controlling the length (L) to be approximately equal to 2.2 than the diameter (D), finishing the drawing ratio of about 2.0 in the process, and finishing the step, wherein the structure of the steel ingot is shown as the fourth drawing in the attached figure 2;
s5: repeating the contents in step S3; the structure of the steel ingot after the step is completed is shown as the fifth drawing in the attached figure 2;
s6: repeating the step S4, and drawing the steel ingot into the size of the number mark, wherein the drawing ratio of the steel ingot in the step is controlled to be about 2.0; the structure of the steel ingot after the step is completed is shown as the sixth graph in the attached figure 2;
s7: and (4) keeping the temperature of 1150 ℃ in a furnace, and forging and pressing the steel ingot into a roller shape. The structure of the ingot after this step is shown in the seventh drawing of fig. 2.
As can be seen from the comparison of the visual data, the roller manufactured by the embodiment 1 and the comparison example is further detected and compared by the mechanics without drawing and upsetting twice in the embodiment 1, and the comparison results are shown in the following table 1,
TABLE 1
As can be seen from the data in Table 1, the amount of rolls consumed for rolling one ton of steel in example 1 is 0.20kg, while the amount of rolls consumed for rolling one ton of steel in comparative example is 0.32kg, so that the amount of rolls consumed for rolling steel in example 1 is smaller and the service life is longer. And the wear resistance and the texture uniformity of example 1 are superior to those of the comparative example.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, which is defined by the claims and their equivalents, and can be directly or indirectly applied to other related fields of technology.
Claims (5)
1. A forging method of a roller is characterized by comprising the following steps,
profiling: pressing the steel ingot into a cuboid steel ingot, removing a riser and a nozzle, wherein the ratio of the length, the width and the height of the pressed steel ingot is 3: 1.5: 1;
upsetting: extruding the steel ingot from two sides of the length direction of the two sides, flattening the length of the steel ingot into half of the original length, wherein the surface of the steel ingot in the width direction and the surface of the steel ingot in the height direction are both in an arc shape;
forging and pressing: forging and pressing the steel ingot, and rotating by 90 degrees to continuously forge and press the next surface after forging and pressing one surface each time;
a forming step: and forging and pressing the steel ingot.
2. The forging method of a roll according to claim 1, wherein the temperature of the steel slab in the profiling step is 1170 to 1190 ℃.
3. The forging method of a roll according to claim 1, wherein the temperature of the steel slab in the upsetting step is 1220 to 1240 ℃.
4. The forging method of a roll according to claim 1, wherein the temperature of the steel slab in the forming step is 1140 ℃ to 1160 ℃.
5. The method for forging a roll according to claim 1, wherein the steel ingot is a Cr5 steel ingot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010454008.0A CN111468669B (en) | 2020-05-26 | 2020-05-26 | Forging method of roller |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010454008.0A CN111468669B (en) | 2020-05-26 | 2020-05-26 | Forging method of roller |
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| Publication Number | Publication Date |
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| CN111468669A true CN111468669A (en) | 2020-07-31 |
| CN111468669B CN111468669B (en) | 2022-04-15 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102528382A (en) * | 2010-12-10 | 2012-07-04 | 上海重型机器厂有限公司 | Manufacture method of cold-rolled roller |
| CN103831379A (en) * | 2014-02-11 | 2014-06-04 | 马鞍山市恒毅机械制造有限公司 | Forging method for cold roll blank |
| CN105861952A (en) * | 2015-01-23 | 2016-08-17 | 鞍钢股份有限公司 | Forging rough rolling tool steel roller and manufacturing method thereof |
| CN105945190A (en) * | 2016-06-20 | 2016-09-21 | 安徽省瑞杰锻造有限责任公司 | Free forging technology of large-scale module |
| CN107008837A (en) * | 2017-05-10 | 2017-08-04 | 鞍钢重型机械有限责任公司 | A kind of inexpensive open die forging method of large-scale edger roll forging |
| CN110405121A (en) * | 2019-06-26 | 2019-11-05 | 中信重工机械股份有限公司 | A kind of forging method of Heavy Back-Up Roll forging |
-
2020
- 2020-05-26 CN CN202010454008.0A patent/CN111468669B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102528382A (en) * | 2010-12-10 | 2012-07-04 | 上海重型机器厂有限公司 | Manufacture method of cold-rolled roller |
| CN103831379A (en) * | 2014-02-11 | 2014-06-04 | 马鞍山市恒毅机械制造有限公司 | Forging method for cold roll blank |
| CN105861952A (en) * | 2015-01-23 | 2016-08-17 | 鞍钢股份有限公司 | Forging rough rolling tool steel roller and manufacturing method thereof |
| CN105945190A (en) * | 2016-06-20 | 2016-09-21 | 安徽省瑞杰锻造有限责任公司 | Free forging technology of large-scale module |
| CN107008837A (en) * | 2017-05-10 | 2017-08-04 | 鞍钢重型机械有限责任公司 | A kind of inexpensive open die forging method of large-scale edger roll forging |
| CN110405121A (en) * | 2019-06-26 | 2019-11-05 | 中信重工机械股份有限公司 | A kind of forging method of Heavy Back-Up Roll forging |
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| CN111468669B (en) | 2022-04-15 |
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Inventor after: Hao Mingshan Inventor after: Ye Changhui Inventor after: Zheng Feng Inventor after: Jiang Bo Inventor before: Hao Mingshan Inventor before: Ye Changhui Inventor before: Zheng Feng Inventor before: Jiang Bo |
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Address after: 311100 No. 5, tangsheng street, industrial zone, Tangqi Town, Yuhang District, Hangzhou City, Zhejiang Province Patentee after: Hangzhou Steam Turbine Casting and Forging Co.,Ltd. Address before: 311100 No. 5, tangsheng street, industrial zone, Tangqi Town, Yuhang District, Hangzhou City, Zhejiang Province Patentee before: HANGZHOU STEAM TURBINE CASTING AND FORGING Co.,Ltd. |