CN109226623A - The cross forging method of hot die steel - Google Patents
The cross forging method of hot die steel Download PDFInfo
- Publication number
- CN109226623A CN109226623A CN201810969981.9A CN201810969981A CN109226623A CN 109226623 A CN109226623 A CN 109226623A CN 201810969981 A CN201810969981 A CN 201810969981A CN 109226623 A CN109226623 A CN 109226623A
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- CN
- China
- Prior art keywords
- pulling
- die steel
- hot die
- esr ingot
- forging method
- 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.)
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Classifications
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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
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
-
- 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
-
- 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
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
Abstract
The present invention is the cross forging method of hot die steel, and using High temperature diffusion twice, the time extends, and improves diffusion effect, pulling base is because sectional dimension is less than ESR ingot, therefore its diffusion effect is good.In forging deformation, the deformation rate of radial (transverse direction) is increased, the radial deformation rate of single can achieve 4 (traditional forging technology single radial deformation rate is only 2).The radial deformation rate of single increases, and can better break up biggish dendrite and column crystal, the isometric essence uniformly refined, improves distribution of the carbide in steel, to achieve the purpose that improve side knock function.Generous exchange (slab is had rotated 90 °) intersects pulling, so that radial both direction deformation is uniform, center portion can be preferably compacted, achieve the effect that broken dendrite and column crystal, divide equally distribution of carbides, to achieve the purpose that improve side knock function.Pull out the forging ratio of base reserved 1.8~2.0, last igneous type.
Description
Technical field
The invention belongs to mould steel technical field of forging, the cross forging method of specifically a kind of hot die steel.
Background technique
Hot die steel is the alloy tool steel that thermal deformation processing mold is carried out to metal, is chronically at high temperature and pressure item
Under part, it is desirable to have high intensity, high tenacity, resistance to HI high impact.Hot die steel, such as HDMA alloy content are high, a large amount of alloy
The addition of element moves to left eutectoid point, belong to hypereutectoid steel, the macrosegregation of carbon and alloying element, especially chromium, vanadium
Effect, so that unbalanced substable eutectic carbide occurs in process of setting in the steel, and eutectic carbide is assembled in crystal boundary
The impact toughness of mold is influenced very big.Simultaneously because be in mold use process it is direction-free, this requires molds to have very
The tropisms such as good mechanics, higher side knock.
Since conventional three upsetting three of forging method is pulled out, be axially repeatedly jumping-up and pulling to be crushed eutectic carbide,
Lateral mechanical property is improved by jumping-up three times, however after three conventional upsettings three are pulled out, although side knock increases, but
To be difficult to break through 250J, the module of big specification still remains the eutectic carbon object of bulky grain, etc. tropisms (side knock function and longitudinal rush
Hit the ratio between function) less than 0.75, still remain banded segregation.
Summary of the invention
Background technique there are aiming at the problem that, improve the broken of eutectic carbide the purpose of the present invention is to provide a kind of
Rate makes the cross forging that the deformation of workpiece all directions to be added is uniform, improves banded segregation, improves iso hot die steel
Method.
In order to achieve the above objectives, the cross forging method for the hot die steel that the present invention designs, comprising the following steps:
One) ESR ingot is heated to 1240 ± 10 DEG C, and keeps the temperature a period of time；
Two) ESR ingot after heat preservation is taken out, removes end to end and guarantees that section is smooth, after carrying out axial jumping-up to ESR ingot
Radial pulling melts down heat preservation a period of time behind smooth both ends to slab again；
Three) take out step 2) in ESR ingot, radially axial pulling is melted down behind smooth both ends to slab again after jumping-up
Heat preservation a period of time；
Four) take out step 3) in ESR ingot, it is axial again after being rotated by 90 ° after axial jumping-up to intersect pulling and pull out to one
Long base, and a forging ratio is reserved, melt down heat preservation a period of time；
Five) take out step 4) in ESR ingot, pulling is to forging's block dimension；
The above axial, radial direction is with original ESR ingot axially and radially for reference.
Preferably, step 1) in soaking time be 10~14 hours.Long-time heat preservation at high temperature is conducive to alloy
The diffusion of element has the function that improve segregation.
Preferably, step 2) in first axial jumping-up carry out radial pulling again to the 1/2 of ESR ingot height.
Preferably, step 2) in slab width-thickness ratio control in 1.2~1.4:1, ratio of height to diameter is between 2.2~2.5.
Preferably, step 2) in the temperature melted down be 1240 ± 10 DEG C, the time of heat preservation is 3 hours.
Preferably, step 3) in first radially jumping-up carries out axial pulling to the 1/2 of blank height again.
Preferably, step 3) in slab width-thickness ratio control in 1.2~1.4:1, ratio of height to diameter is between 2.2~2.5.
Preferably, step 3) in the temperature melted down be 1240 ± 10 DEG C, the time of heat preservation is 3 hours.
Preferably, step 4) in first axial jumping-up carry out axial intersecting pulling again to the 1/2 of ESR ingot height.
Preferably, step 4) in pulling base width it is 100~150 millimeters bigger than forging's block dimension.
Preferably, step 4) in the reserved forging ratio of pulling base be 1.8~2.0.
Preferably, step 4) in the temperature melted down be 1220 ± 10 DEG C, the time of heat preservation is 14 hours.
The beneficial effects of the present invention are: 1, using high-temperature diffusion process twice, first step 1) in ESR ingot 1240 ± 10
DEG C heat preservation 12h, secondly step 4) in pull out 1220 ± 10 DEG C of heat preservation 14h of base.The present invention is prolonged using High temperature diffusion, time twice
Long, improve diffusion effect, while increasing step 4) in High temperature diffusion, pulling base because sectional dimension is less than ESR ingot, therefore
Its diffusion effect is than step 1) than get well.2, in forging deformation, the deformation rate of radial (transverse direction), especially step 2 are increased) in
Axial jumping-up after radial pulling, the radial deformation rate of single can achieve 4 (traditional forging technology single radial deformation rates again
Only 2).The radial deformation rate of single increases, and can better break up biggish dendrite and column crystal, uniformly refined etc.
Axis essence improves distribution of the carbide in steel, to achieve the purpose that improve side knock function.3, step 4) in generous exchange
(slab is had rotated 90 °) intersects pulling, so that radial both direction deformation is uniformly, can preferably be compacted center portion, reach
The effect of broken dendrite and column crystal, divides equally distribution of carbides, to achieve the purpose that improve side knock function.4, step
Four) forging ratio of pulling base reserved 1.8~2.0 in, in step 5) in an igneous type.Enough deflections under the condition of high temperature, can be more
Carbide is smashed well, is allowed to be evenly distributed.Suitable temperature and suitable deflection ensure one-heating forming, do not return burning high temperature.
Temperature is high, and crystal can be coarse, and temperature is low, and deformation can crack.The control of suitable temperature and deflection is also for raising
Ballistic work.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is the deformation schematic diagram of step two of the invention；
Fig. 2 is the deformation schematic diagram of step three of the invention；
Fig. 3 is the deformation schematic diagram of step four of the invention；
Wherein, grey face is illustrated as the upper surface of ESR ingot in figure.
Specific embodiment
Below by FIG. 1 to FIG. 3 and the modes of some alternative embodiments of the invention is enumerated, to technical side of the invention
Case (including optimal technical scheme) is described in further detail.Obviously, described embodiment is only of the invention one
Divide embodiment, instead of all the embodiments.Based on the embodiment of the present invention, those of ordinary skill in the art are not making wound
Every other embodiment obtained under the premise of the property made labour, shall fall within the protection scope of the present invention.
The cross forging method for the hot die steel that the present invention designs, comprising the following steps:
One) ESR ingot is heated to 1240 ± 10 DEG C, and keeps the temperature 10~14 hours.Long-time heat preservation at high temperature, favorably
In the diffusion of alloying element, have the function that improve segregation.
Two) ESR ingot after heat preservation is taken out, earnestly end to end using marking knife, guarantee section it is smooth (the smooth difficulty in section compared with
Greatly, band saw cold cut after ESR ingot is annealed can also be used, but band saw cold cut is in step 1) before), as shown in Figure 1, to ESR ingot
Axial jumping-up is carried out to the 1/2 of ESR ingot height, then again radial pulling to slab, the control of the width-thickness ratio of slab 1.2~
1.4:1, ratio of height to diameter is between 2.2~2.5, smooth both ends, then melts down 1240 ± 10 DEG C and keeps the temperature 3 hours.
Three) take out step 2) in ESR ingot, as shown in Fig. 2, radially jumping-up is to the 1/2 of blank height, then axis again
To pulling to slab, slab specification presses step 2) in slab specifications control, melt down 1240 ± 10 DEG C of heat preservations 3 behind smooth both ends
Hour.
Four) take out step 3) in ESR ingot then will as shown in figure 3, along axial jumping-up to the 1/2 of ESR ingot height
ESR ingot is axial again after being rotated by 90 ° to intersect pulling to a pulling base, pulls out width 100~150 milli bigger than forging's block dimension of base
Rice, the reserved forging ratio of pulling base is 1.8~2.0, melts down 1220 ± 10 and keeps the temperature 14 hours.
Five) take out step 4) in ESR ingot, pulling is to forging's block dimension；
The above axial, radial direction is with original ESR ingot axially and radially for reference.
It should be readily apparent to one skilled in the art that the above is merely preferred embodiments of the present invention, not to limit this hair
Bright, all any modification, combination, replacement, improvement etc. made under the spirit and principles in the present invention are all contained in guarantor of the invention
Within the scope of shield.
Claims (10)
1. a kind of cross forging method of hot die steel, comprising the following steps:
One) ESR ingot is heated to 1240 ± 10 DEG C, and keeps the temperature a period of time；
Two) ESR ingot after heat preservation is taken out, to radial pulling is removed end to end simultaneously to slab again after the axial jumping-up of ESR ingot progress
Guarantee that section is smooth, heat preservation a period of time is melted down behind smooth both ends；
Three) take out step 2) in ESR ingot, radially axial pulling is removed end to end to slab and guarantees section again after jumping-up
It is smooth, heat preservation a period of time is melted down behind smooth both ends；
Four) take out step 3) in ESR ingot, it is axial again after being rotated by 90 ° after axial jumping-up to intersect pulling to a pulling base,
And a forging ratio is reserved, melt down heat preservation a period of time；
Five) take out step 4) in ESR ingot, pulling is to forging's block dimension；
The above axial, radial direction is with original ESR ingot axially and radially for reference.
2. the cross forging method of hot die steel according to claim 1, it is characterised in that: step 1) in heat preservation
Time is 10~14 hours.
3. the cross forging method of hot die steel according to claim 1, it is characterised in that: step 2) in it is first axial
Jumping-up carries out radial pulling to the 1/2 of ESR ingot height again；The control of the width-thickness ratio of slab exists in 1.2~1.4:1, ratio of height to diameter
Between 2.2~2.5.
4. the cross forging method of hot die steel according to claim 1, it is characterised in that: in the temperature melted down be
1240 ± 10 DEG C, the time of heat preservation is 3 hours.
5. the cross forging method of hot die steel according to claim 1, it is characterised in that: step 3) in first along diameter
1/2 to jumping-up to blank height carries out axial pulling again；The control of the width-thickness ratio of slab exists in 1.2~1.4:1, ratio of height to diameter
Between 2.2~2.5.
6. the cross forging method of hot die steel according to claim 1, it is characterised in that: step 3) in melt down
Temperature is 1240 ± 10 DEG C, and the time of heat preservation is 3 hours.
7. the cross forging method of hot die steel according to claim 1, it is characterised in that: step 4) in it is first axial
Jumping-up carries out axial intersection to the 1/2 of ESR ingot height again and pulls out.
8. the cross forging method of hot die steel according to claim 1, it is characterised in that: step 4) in pull out base
Width it is 100~150 millimeters bigger than forging's block dimension.
9. the cross forging method of excellent hot die steel according to claim 1, it is characterised in that: step 4) in pulling
The reserved forging ratio of base is 1.8~2.0.
10. the cross forging method of hot die steel according to claim 1, it is characterised in that: step 4) in melt down
Temperature is 1220 ± 10 DEG C, and the time of heat preservation is 14 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810969981.9A CN109226623A (en) | 2018-08-24 | 2018-08-24 | The cross forging method of hot die steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810969981.9A CN109226623A (en) | 2018-08-24 | 2018-08-24 | The cross forging method of hot die steel |
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| Publication Number | Publication Date |
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| CN109226623A true CN109226623A (en) | 2019-01-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810969981.9A Pending CN109226623A (en) | 2018-08-24 | 2018-08-24 | The cross forging method of hot die steel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111230015A (en) * | 2020-02-27 | 2020-06-05 | 无锡派克新材料科技股份有限公司 | High-temperature alloy grain refinement method |
| CN111250640A (en) * | 2020-02-29 | 2020-06-09 | 河南中原特钢装备制造有限公司 | Hot working method of large-diameter refined hot work die steel forging |
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| CN106521124A (en) * | 2016-08-26 | 2017-03-22 | 湖北东舟重工科技股份有限公司 | Forked flattening, upsetting, and rolling H13 hot-working die steel homogenization forging technology |
| CN107699789A (en) * | 2017-08-24 | 2018-02-16 | 唐山志威科技有限公司 | A kind of high tenacity, high thermal stability ZW866 hot die steel for die-casting and preparation method thereof |
| CN107904510A (en) * | 2017-11-21 | 2018-04-13 | 重庆文理学院 | Comprehensive high performance hot die steel of one kind and preparation method thereof |
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2018
- 2018-08-24 CN CN201810969981.9A patent/CN109226623A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106521124A (en) * | 2016-08-26 | 2017-03-22 | 湖北东舟重工科技股份有限公司 | Forked flattening, upsetting, and rolling H13 hot-working die steel homogenization forging technology |
| CN107699789A (en) * | 2017-08-24 | 2018-02-16 | 唐山志威科技有限公司 | A kind of high tenacity, high thermal stability ZW866 hot die steel for die-casting and preparation method thereof |
| CN107904510A (en) * | 2017-11-21 | 2018-04-13 | 重庆文理学院 | Comprehensive high performance hot die steel of one kind and preparation method thereof |
Non-Patent Citations (2)
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| 徐咏梅等: "十字锻造法在热作模具钢上的生产实践", 《黑龙江冶金》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111230015A (en) * | 2020-02-27 | 2020-06-05 | 无锡派克新材料科技股份有限公司 | High-temperature alloy grain refinement method |
| CN111250640A (en) * | 2020-02-29 | 2020-06-09 | 河南中原特钢装备制造有限公司 | Hot working method of large-diameter refined hot work die steel forging |
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Application publication date: 20190118 |
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| RJ01 | Rejection of invention patent application after publication |