CN111922264A - Radial forging non-rotating forging method - Google Patents
Radial forging non-rotating forging method Download PDFInfo
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- CN111922264A CN111922264A CN202010576109.5A CN202010576109A CN111922264A CN 111922264 A CN111922264 A CN 111922264A CN 202010576109 A CN202010576109 A CN 202010576109A CN 111922264 A CN111922264 A CN 111922264A
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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
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Abstract
The invention provides a radial forging non-rotating forging method, which is characterized in that a radial forging machine is used for forging a blank, four symmetrically distributed hammers are mounted on the radial forging machine, two hammers which are oppositely arranged are a group of hammers, and the other two hammers which are oppositely arranged are two groups of hammers, and comprises the following steps: forging without rotation: the blank is not rotated and only fed, and the blank is synchronously forged to a set specification by one group of hammers and two groups of hammers; forging without rotating and executing a plurality of passes; rotary forging: the blank is fed and forged while rotating; circle throwing: and (5) throwing the round to obtain the final finished round steel. Aiming at the defect of insufficient forging penetration of the radial forging machine, the invention adopts non-rotary forging and realizes the forging of the radial forging machine by controlling the parameters such as rolling reduction, feeding amount, forging frequency, forging position and the like.
Description
Technical Field
The invention relates to the technical field of forging, in particular to a radial forging non-rotating forging method.
Background
At present, two pairs of four symmetrically distributed hammers are installed on a Simma (SMS) hydraulic radial forging machine and are respectively and independently controlled by four hydraulic cylinders, synchronous action can be realized, when the radial forging machine works, the four hammers synchronously carry out closed reciprocating high-speed high-frequency precision forging on a metal blank from four directions, meanwhile, an operating machine can realize rotary forging at different angles, and the forging frequency of the radial forging machine can reach 220 times/minute at most. Because the forging frequency is high, the temperature change in the forging process is small, and the forging process realizes one-step hot-forging. The radial forging machine has the advantages of high production efficiency, good dimensional precision control and the like, and is widely applied to the production of shaft forgings.
Because the forging process is rotary forging and the forging process is small deformation accumulation forging, the forging permeability of steel is not well controlled, and particularly for larger specifications (more than or equal to phi 300), the influence on the internal performance is large, and defects of unqualified flaw detection such as looseness, shrinkage cavity and the like are often caused.
Disclosure of Invention
The invention aims to provide a radial forging non-rotating forging method, which can greatly improve the problem of insufficient forging penetration of a radial forging machine. Aiming at the defect of insufficient forging penetration of the radial forging machine, the invention adopts non-rotary forging and realizes the forging of the radial forging machine by controlling the parameters such as rolling reduction, feeding amount, forging frequency, forging position and the like.
In order to achieve the above purpose, the invention provides the following technical scheme:
the utility model provides a footpath is forged nonrotating and is forged method, utilizes the footpath forging press to forge the blank, and the footpath forging press is installed four symmetric distribution's tup, and wherein two relative tups that set up are a set of tup, and two relative tups that set up are two sets of tups in addition, includes following step: forging without rotation: the blank is not rotated and only fed, and the blank is synchronously forged to a set specification by one group of hammers and two groups of hammers; forging without rotating and executing a plurality of passes; rotary forging: the blank is fed and forged while rotating; circle throwing: and (5) throwing the round to obtain the final finished round steel.
Further, in the above radial forging non-rotating forging method, if the billet is a non-circular billet, a step of rotating synchronous forging is provided before the non-rotating forging step: the group of hammers and the two groups of hammers rotate and synchronously forge the blank, and finish the blank to an approximately circular blank, wherein the approximately circular blank refers to a blank shape formed by radial forging of a regular 12-sided shape, namely a blank shape obtained by synchronous forging of a hydraulic radial forging machine by rotating 30 degrees.
Further, in the above radial forging non-rotating forging method, the rotating synchronized forging is performed for 1 to 2 passes.
Further, in the above radial forging non-rotating forging method, the non-rotating forging specifically includes the steps of: i, synchronously forging a group of hammers and two groups of hammers to set specifications, feeding the blank only without rotating, and controlling the feeding amount and the frequency, which is a pass; II, rotating the blank by 45 degrees relative to the blank in the step I, synchronously forging the group of hammers and the two groups of hammers to set specifications according to requirements, feeding the blank only by controlling the feeding amount and the frequency without rotating the blank, and thus forming a pass; III repeating the step I and the step II for several times until the forging is close to the finished specification blank.
Further, in the above-described radial forging non-rotating forging method, in the steps I and II: in the whole non-rotating forging step, the reduction of 1-2 passes is slightly 10% -11.5%, and the reduction of the rest passes is more than 12%.
Further, in the above-described radial forging non-rotating forging method, in the steps I and II: the feeding amount is 0.5-0.8 of the length of the working surface of the hammer head.
Further, in the above-described radial forging non-rotating forging method, in the steps I and II: the frequency is 1200 and 2000 ms/time.
Further, in the above radial forging non-rotating forging method, the non-rotating forging is performed for 4 to 10 passes.
Further, in the above radial forging non-rotating forging method, the rotary forging is performed after the billet is rotated to 0 ° in the rotary forging step.
Further, in the above radial forging non-rotating forging method, when the specification of the substantially circular blank is 600mm, the non-rotating forging is performed for 8 passes in total, and the specifications set for the 8 passes are, in order: 540mm-520mm-480mm-452mm-400mm-372mm-320mm-307 mm.
The analysis shows that the invention discloses a radial forging non-rotating forging method, aiming at the defect of insufficient forging penetration of a radial forging machine, the invention adopts non-rotating forging and realizes the forging of the radial forging machine by controlling the parameters such as rolling reduction, feeding amount, forging frequency, forging position and the like. The deformation principle of non-rotating forging is similar to the principle of a rapid forging machine for improving the forging penetration of steel materials by large reduction and large feed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. Wherein:
FIG. 1 is a schematic illustration of a non-rotating forging pass according to an embodiment of the present invention.
Description of reference numerals: 1 × 540mm is the 1 st pass of non-rotating forging; 2 x 520mm is the 2 nd pass of non-rotating forging; 3 x 480mm is the 3 rd pass of non-rotating forging; 4 x 452mm is the 4 th pass of non-rotating forging; 5 x 400mm is the 5 th pass of non-rotating forging; 6 x 372mm is the 6 th pass of non-rotating forging; 7 x 320mm is the 7 th pass of non-rotating forging; 8 x 307mm is the 8 th pass of non-rotating forging.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. The various examples are provided by way of explanation of the invention, and not limitation of the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit thereof. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present invention encompass such modifications and variations as fall within the scope of the appended claims and equivalents thereof.
As shown in fig. 1, according to an embodiment of the present invention, a radial forging non-rotating forging method is provided, wherein radial forging can be performed by a simacre (SMS) hydraulic radial forging machine, and the hydraulic radial forging machine is provided with two sets of four symmetrically distributed hammers, and one set of two hammers is arranged oppositely.
The radial forging non-rotating forging method comprises the following steps:
1) rotary synchronous forging
This step is not required if the incoming material is a round billet.
If the incoming material is a non-circular blank, two groups of hammers of the hydraulic radial forging machine rotate and synchronously forge the incoming material to be a nearly circular blank in a precise mode, and the rotating and synchronous forging can be carried out for 1-2 passes. The rotary synchronous forging is generally performed in 1-2 passes, namely a first pass (total one pass) or a first pass and a second pass (total two passes), according to the blank type of the incoming material. The approximately circular blank is a regular 12-sided blank formed by radial forging, namely a blank obtained by synchronous forging by rotating a hydraulic radial forging machine by 30 degrees.
When the rotary synchronous forging is carried out, the forging frequency is 950 ms/time to 1400 ms/time (such as 950 ms/time, 1000 ms/time, 1050 ms/time, 1100 ms/time, 1150 ms/time, 1200 ms/time, 1250 ms/time, 1300 ms/time, 1350 ms/time and 1400 ms/time).
2) Forging without rotation
If the incoming material is a circular blank, non-rotating forging is directly started.
The incoming material is a circular blank or the circular blank obtained in the step 1) is subjected to non-rotating forging.
The non-rotating forging specifically comprises:
2.1 for convenient operation and error avoidance, the manipulator clamps the round blank and rotates to a 45-degree position, one group of hammers and two groups of hammers are synchronously forged to a certain specification according to requirements, the blank does not rotate and is only fed, and the feeding amount and the frequency are controlled. This is one pass.
2.2, the blank rotates 45 degrees relative to the blank in the step 2.1, namely the circular blank is clamped by the manipulator and rotates to a position of 90 degrees, one group of hammers and two groups of hammers are synchronously forged to a certain specification according to requirements, the blank does not rotate and is only fed, and the feeding amount and the frequency are controlled. This is one pass.
The specific parameters in steps 2.1 and 2.2 are as follows: the rolling reduction of the whole non-rotating forging process is generally reduced to 9.5-11.5% in 1-2 passes. In example 1, the reduction in the 1 st pass was (600-. Forging in the same direction for the 1 st pass, the 3 rd pass, the 5 th pass and the 7 th pass; the 2 nd, 4 th, 6 th and 8 th passes are forging in the same direction.
The other passes are main deformation passes, the reduction of the main deformation passes is more than 12%, and the reduction of the main deformation passes is generally 12% -25% of the specification of the blank (such as 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%). Reduction in other passes as in example 1:
and 2, pass: (600-520)/600-13.33%,
and 4, pass: (520-452)/520-13.08%,
and (5) pass: (480-,
and 6, pass: (452-372)/452-17.7%,
and 7, pass: (400-320)/400-20%,
and 8, pass: (372-307)/372-17.47%.
The feeding amount is generally 0.5-0.8 (such as 0.5, 0.55, 0.6, 0.65, 0.7, 0.75 and 0.8) of the length of the working surface of the hammer head, and is determined according to the characteristics of steel grades and the specification of blanks; the frequency is generally 1200-2000 ms/time (such as 1200 ms/time, 1250 ms/time, 1300 ms/time, 1350 ms/time, 1400 ms/time, 1450 ms/time, 1500 ms/time, 1550 ms/time, 1600 ms/time, 1650 ms/time, 1700 ms/time, 1750 ms/time, 1800 ms/time, 1850 ms/time, 1900 ms/time, 1950 ms/time, 2000 ms/time) according to the steel type characteristics.
2.3 repeating the 2.1 and 2.2 passes until the forging is close to the finished specification blank. The near-gauge billet refers to the final pass gauge of non-rotary forging, and is generally an irregular billet, such as the 307 gauge of example 1, and is near 307 gauge when forged to the 320 and 307 gauges.
Using current 16MN radial forging machines, non-rotating forging typically performs 4-10 passes, such as 4 passes, 5 passes, 6 passes, 7 passes, 8 passes, 9 passes, 10 passes. The specific number of passes is determined according to the specification of the circular blank and the condition of the finished product specification. Different rolling reductions are set according to the steel type, the blank specification and the finished product specification until the forging is close to the finished product specification blank. As in the specification of 600 round, finished product 307 in example 1, the design pass is 8 passes: 540-520-480-452-400-372-320-307.
Through the irrotational forging and the control of the rolling reduction, the feeding amount, the forging frequency and the forging position, the forging of the radial forging machine is realized, the forging permeability of steel is well controlled, the internal performance of the large-specification finished product is stable, and the defect of unqualified flaw detection such as looseness and shrinkage cavity is avoided.
3) Rotary forging
After several passes of non-rotating forging pressing, the circular blank is forged to be close to a finished product specification blank, and then the rotary forging of the step is performed, wherein the rotary forging of the step is one pass.
The rotary forging of this step specifically includes: and (3) carrying out rotary forging after the manipulator clamping jaws clamp the circular blank and rotate to a certain angle, and carrying out rotary forging while feeding forging. The certain angle refers to 0 degrees, the selection of 0 degrees can facilitate pass identification, and the rotary forging is started when the pass marked with the non-rotary forging is finished.
4) Circle throwing: and (5) throwing the round to obtain the final finished round steel. And the circle throwing is the last pass, and can carry out shaping control on the surface and the dimensional tolerance of the finished product.
Aiming at the defect of insufficient forging penetration of the radial forging machine, the invention adopts a non-rotating forging step and realizes the forging of the radial forging machine by controlling the parameters such as rolling reduction, feeding amount, forging frequency, forging position and the like. The deformation principle of non-rotating forging is similar to the principle of a rapid forging machine for improving the forging penetration of steel materials by large reduction and large feed. The internal performance of the finished product is good and stable, and the defects of looseness, shrinkage cavity and the like which are unqualified for flaw detection are avoided.
Example 1
The incoming materials are as follows: 5.4t of octagonal ingot, 316L steel grade; the finished material is 307 circles, the heating temperature is 1210 +/-10 ℃, the temperature is kept for 6.5 hours, and then the material is discharged to a 16MN radial forging machine for forging (the forging range of the current 16MN hydraulic radial forging machine is 300 plus 500mm), and the specific forging steps are as follows:
1) rotary synchronous forging
Chamfering and forging in the first pass, rotating and synchronously forging the group of hammers and the group of hammers at a rotation angle of 22.5 degrees, feeding the hammers into the forging machine at a position of 0 degree, forging the hammers at a frequency of 1300 ms/time, and forging a blank with a specification of 660 mm;
and in the second pass, the group and the two groups of hammers are synchronously forged in a rotating way, the rotating angle is 30 degrees, the feeding is 60mm, the forging position of the operating machine is 0 degree, the forging frequency is 950 ms/time, and approximately circular blanks with the specification of 600mm are forged.
2) Forging without rotation
And performing eight passes in total by non-rotating forging, wherein the third pass to the tenth pass are non-rotating forging.
The non-rotating forging is concretely as follows:
2.1 third pass: the manipulator clamps the blank to rotate to a position of 45 degrees, one group and two groups of hammer heads are synchronously forged to a square blank with the specification of 540 according to requirements, the blank is not rotated and only fed, the feeding amount is 200mm, and the forging frequency is 1900 ms/time.
2.2 fourth pass: the manipulator clamps the blank to rotate to a 90-degree forging position, one group of hammer heads and two groups of hammer heads are synchronously forged to a 520-specification square blank according to requirements, the blank is not rotated and only fed, the feeding amount is 200mm, and the forging frequency is 2000 ms/time.
2.3 fifth-tenth pass: repeating 2.1 and 2.2 to respectively forge to specifications of 480mm, 452mm, 400mm, 372mm, 320mm and 307mm, wherein the specific specifications of the third pass to the tenth pass are as follows: 540mm-520mm-480mm-452mm-400mm-372mm-320mm-307 mm.
3) Rotary forging
And eleventh pass: the manipulator clamps the blank and rotates to a ' 0-degree position ' and then performs rotary forging, one group of hammers and two groups of hammers rotate and synchronously forge at the rotation angle of 30 degrees and feed the blank into the die at the rotation angle of 60mm, the manipulator forges the blank at the ' 0-degree position and the forging frequency of 750mm, and the blank with the specification of 307mm is forged into an approximately circular blank, namely a regular 12-edge blank.
4) Circle throwing: and the last pass, namely the twelfth pass, is a circle throwing pass, and the surface and dimensional tolerance of the finished product is shaped and controlled. The manipulator clamps the blank and keeps a '0-degree position' to perform rotary finishing circle-throwing forging, one group of hammers and two groups of hammers rotate to synchronously forge, the turning angle is 10 degrees, the feeding is 20mm, the forging frequency is 300mm, and the final finished round steel with the specification of being forged to 307mm is manufactured.
Obtaining a round steel finished product with 307mm, and detecting: the parameters of size and shape, ultrasonic flaw detection, low power and the like are all qualified. Specifically, the tolerance of the size appearance is 0 to +5mm, other size appearances accord with the GB/T908 standard, and the ultrasonic flaw detection meets the GB/T4162B-level flaw detection standard.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: the invention adopts a non-rotating forging step and realizes the forging of the radial forging machine by controlling parameters such as rolling reduction, feeding amount, forging frequency, forging position and the like. Obtaining the finished product with qualified parameters such as dimension and appearance, ultrasonic flaw detection, macroscopic inspection and the like.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a footpath is forged irrotational forging method, utilizes footpath forging press to forge the blank, and four symmetric distribution's tup are installed to footpath forging press, and wherein two relative tups that set up are a set of tup, and the tup of two relative settings is two sets of tups in addition, its characterized in that includes following step:
forging without rotation: the blank is not rotated and only fed, and the blank is synchronously forged to a set specification by one group of hammers and two groups of hammers; forging without rotating and executing a plurality of passes;
rotary forging: the blank is fed and forged while rotating;
circle throwing: and (5) throwing the round to obtain the final finished round steel.
2. The radial forging non-rotating forging method according to claim 1,
if the blank is a non-circular blank, there is a further step prior to the non-rotating forging step,
rotating and synchronously forging: the one group of hammers and the two groups of hammers rotate and synchronously forge the blank, finish the blank to an approximately circular blank,
the approximately circular blank is a regular 12-sided blank formed by radial forging, namely a blank obtained by synchronous forging by rotating a hydraulic radial forging machine by 30 degrees.
3. The radial forging non-rotating forging method according to claim 2,
the rotary synchronous forging is carried out for 1-2 passes.
4. The radial forging non-rotating forging method according to claim 1,
the non-rotating forging specifically comprises the following steps:
i, synchronously forging a group of hammers and two groups of hammers to set specifications, feeding the blank only without rotating, and controlling the feeding amount and the frequency, which is a pass;
II, rotating the blank by 45 degrees relative to the blank in the step I, synchronously forging the group of hammers and the two groups of hammers to set specifications according to requirements, feeding the blank only by controlling the feeding amount and the frequency without rotating the blank, and thus forming a pass;
III repeating the step I and the step II for several times until the forging is close to the finished specification blank.
5. The radial forging non-rotating forging method according to claim 4,
in said steps I and II: in the whole non-rotating forging step, the reduction of 1-2 passes is slightly 10% -11.5%, and the reduction of the rest passes is more than 12%.
6. The radial forging non-rotating forging method according to claim 4,
in said steps I and II: the feeding amount is 0.5-0.8 of the length of the working surface of the hammer head.
7. The radial forging non-rotating forging method according to claim 4,
in said steps I and II: the frequency is 1200 and 2000 ms/time.
8. The radial forging non-rotating forging method according to claim 4,
the non-rotating forging is performed in 4-10 passes.
9. The radial forging non-rotating forging method according to claim 1,
in the rotary forging step, the rotary forging is performed after the billet is rotated to 0 °.
10. The radial forging non-rotating forging method according to claim 2,
when the specification of the approximately circular blank is 600mm, 8 passes are executed in total without rotating forging, and the set specifications of the 8 passes are as follows:
540mm-520mm-480mm-452mm-400mm-372mm-320mm-307mm。
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Cited By (3)
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| CN113102672A (en) * | 2021-05-20 | 2021-07-13 | 山西太钢不锈钢股份有限公司 | Method for forging five-ton octagonal ingot by using radial forging machine |
| CN114178453A (en) * | 2021-11-04 | 2022-03-15 | 大冶特殊钢有限公司 | Radial forging method of high-alloy square billet |
| WO2024002582A1 (en) * | 2022-06-30 | 2024-01-04 | Sms Group Gmbh | Smx forging strategy |
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| KR101851187B1 (en) * | 2016-12-13 | 2018-04-24 | 한일단조공업주식회사 | Radial forging method for a shaft with 4 pole bodies and shaft manufactured by the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113102672A (en) * | 2021-05-20 | 2021-07-13 | 山西太钢不锈钢股份有限公司 | Method for forging five-ton octagonal ingot by using radial forging machine |
| CN114178453A (en) * | 2021-11-04 | 2022-03-15 | 大冶特殊钢有限公司 | Radial forging method of high-alloy square billet |
| CN114178453B (en) * | 2021-11-04 | 2023-08-18 | 大冶特殊钢有限公司 | Radial forging method of high-alloy square billet |
| WO2024002582A1 (en) * | 2022-06-30 | 2024-01-04 | Sms Group Gmbh | Smx forging strategy |
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