CN105522093A - Upsetting method of bearing steel cake blank - Google Patents
Upsetting method of bearing steel cake blank Download PDFInfo
- Publication number
- CN105522093A CN105522093A CN201510868095.3A CN201510868095A CN105522093A CN 105522093 A CN105522093 A CN 105522093A CN 201510868095 A CN201510868095 A CN 201510868095A CN 105522093 A CN105522093 A CN 105522093A
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- CN
- China
- Prior art keywords
- biscuit
- special tooling
- bearing steel
- impression
- upsetting
- 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
Abstract
The invention discloses an upsetting method of a bearing steel cake blank. The method comprises the following steps: upsetting a bearing steel bar by a conventional method until the deformation of the bearing steel bar reaches 36 to 40%; partially deforming the end surface of a middle cake blank through a special tooling. With the adoption of the method, the defects such as a dead deformation area in the conventional upsetting method can be effectively removed, the structure uniformity of the bearing steel cake blank can be effectively improved, and thus the performance of a forge piece can be improved. The method is applied to the upsetting of the bearing steel cake blank.
Description
Technical field
The present invention relates to a kind of method for upsetting of biscuit, particularly relate to the method for upsetting of bearing steel biscuit.
Background technology
Jumping-up adopts forging press to be reduced and the Forging Technology of cross section increase by the height of metal material, and being the operation important and the most basic together of forging industry, can be subsequent handling, as open die forging, die forging, looping mill rolling etc. provide blank.Usually, in the upsetting process of biscuit, because the chopping block up and down of forging press exists very large friction with the upper and lower end face of excellent base respectively, biscuit upper and lower end face is finally caused all to there is certain distortion dead band (as shown in Figure 1).Relative to other regions of biscuit, the distortion of this district is less even without distortion, result in biscuit unhomogeneity of deformation.This unhomogeneity of deformation directly has influence on the inhomogeneities of the structure property of biscuit, even produces negative influence to follow-up forging process, finally has influence on the structure property of product.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method for upsetting adopting end face local deformation, realizes the jumping-up of bearing steel biscuit, to improve the structural homogenity of bearing steel biscuit, thus improves the performance of forging.
For solving the problems of the technologies described above, the method for upsetting of bearing steel biscuit of the present invention, its technical scheme comprises the following steps:
Diameter be D, highly for the bearing steel bar of H is heated to forging temperature in forge furnace, after insulation a period of time; Bar is placed under forging press on chopping block, drive forging hammer downwards by bar jumping-up to being highly H
0=(0.60 ~ 0.64) H, its deflection is 36% ~ 40%, biscuit in the middle of obtaining;
Be disposed across on middle biscuit by special tooling through the center of middle biscuit, drive forging hammer to pressing down special tooling, special tooling forms first impression on middle biscuit, and the degree of depth of impression is h, completes first time local deformation; By special tooling after the center of middle biscuit is rotated counterclockwise 60 °, be disposed across on middle biscuit, drive forging hammer to pressing down special tooling, special tooling forms second impression on middle biscuit, and the degree of depth of impression is h, completes second time local deformation; Again by special tooling after the center of middle biscuit is rotated counterclockwise 60 °, be disposed across on middle biscuit, drive forging hammer to pressing down special tooling, special tooling forms the 3rd road impression on middle biscuit, and the degree of depth of impression is h, completes for the third time local deformation; Special tooling is taken out, drives forging hammer to press to middle biscuit, under the effect of forging hammer and lower chopping block, the impression of middle biscuit is disappeared completely, completes the gathering stock of upper surface;
Middle biscuit is turned, according to the operation of above-mentioned upper surface gathering stock, the other end of middle biscuit completes the gathering stock of lower surface, obtain bearing steel biscuit.
Described special tooling to the depth of cup of middle biscuit is:
Wherein, H is the height of bar;
H
0for the height of middle biscuit;
σ, for being out of shape the ratio of volume shared by dead band during conventional deformation, gets 0.15 ~ 0.3.
Described special tooling is bar, its width d=(0.2 ~ 0.3) D
0; D
0for the diameter of middle biscuit.
Described bearing steel is G20Cr2Ni4.
Compared with prior art, beneficial effect of the present invention is as follows:
The method for upsetting of bearing steel biscuit of the present invention, by employing, prepared by bearing steel biscuit to the method for upsetting that the end face of biscuit carries out local deformation, the advantage of the method is, the distortion of gained bearing steel biscuit evenly, there is not distortion dead band, greatly enhance the forging performance of follow-up forging and molding.
This method first by conventional for bearing steel biscuit jumping-up to H
0=(0.60 ~ 0.64) H is to ensure that the deflection of bearing steel biscuit zone line can reach 36% ~ 40%; Special tooling to the depth of cup of middle biscuit is
that its deflection can be consistent with zone line in order to ensure that bearing steel biscuit distortion dead band is by end face local deformation.
Width d=(0.2 ~ 0.3) D of special tooling described in this method
0, defects such as can not folding when carrying out smooth to the impression of middle biscuit can be ensured.
Adopt bearing steel biscuit prepared by said method, obtaining the forging of even tissue, better performances after forging and molding, is that the bearing steel forging of G20Cr2Ni4 is example with the trade mark:
This steel forgings even tissue, crystal grain are tiny after testing, meet technical conditions requirement.
This steel forgings is without groove, the blemish such as folding after testing.
The room temperature tensile properties of this steel forgings after testing, its tensile strength is 1075MPa (being greater than the 1058.4MPa of design instructions for use), and elongation after fracture was 6% (being greater than 5% of design instructions for use).
The testing result of the drawing by high temperature duration running of this steel forgings also all meets technical conditions requirement after testing.
Above-mentioned Physico-chemical tests result shows, the G20Cr2Ni4 steel forgings property indices adopting the bearing steel biscuit after improving to be shaped all meets the requirements.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is the biscuit schematic diagram of prior art jumping-up.
Fig. 2 is middle biscuit structural representation.
Fig. 3 is middle biscuit end face local deformation schematic diagram.
Fig. 4 is the rotation schematic diagram of special tooling.
Detailed description of the invention
Implement bearing steel biscuit method for upsetting of the present invention to need to provide the equipment such as forge furnace, forcing press, manipulator, special tooling.The bearing steel being G20Cr2Ni4 for China's material trademark below describes the detailed description of the invention of the method in detail:
The main chemical elements content (percentage by weight) of this steel is: C content 0.17% ~ 0.23%, containing Mn amount 0.30% ~ 0.60%, si content 0.15% ~ 0.40%, containing S amount≤0.030%, P content≤0.030%, containing Cr amount 1.25% ~ 1.75%, ni content 3.25% ~ 3.75%, containing Cu amount≤0.25, surplus is Fe.
The step of this method is as follows:
Step 1: conventional jumping-up.
Diameter be D, highly for the bearing steel bar of H is heated to forging temperature in forge furnace, after insulation a period of time; Bar is placed under forging press on chopping block, in order to ensure that the deflection of jumping-up rear bearing steel biscuit zone line can reach 36% ~ 42%, by bar jumping-up to being highly H
0=(0.60 ~ 0.64) H, biscuit 1 in the middle of obtaining, as shown in Figure 2.
Step 2: upper surface gathering stock.
As shown in the figure, special tooling 2 is disposed across on middle biscuit 1 through the center of middle biscuit 1, for ensureing defects such as can not folding when carrying out smooth to the impression of middle biscuit 1, width d=(0.2 ~ 0.3) D of special tooling 2 used
0, drive forging hammer with the pressure of F size, to pressing down special tooling 2, special tooling 2 forms first impression on middle biscuit 1, and the degree of depth of impression is h, completes first time local deformation; As shown in Figure 3, by special tooling 2 after the center of middle biscuit 1 is rotated counterclockwise 60 °, be disposed across on middle biscuit 1, drive forging hammer to pressing down special tooling 2, special tooling 2 forms second impression on middle biscuit 1, and the degree of depth of impression is h, completes second time local deformation; Again by special tooling 2 after the center of middle biscuit 1 is rotated counterclockwise 60 °, be disposed across on middle biscuit 1, drive forging hammer to pressing down special tooling 2, special tooling 2 forms the 3rd road impression on middle biscuit 1, the degree of depth of impression is h, completes third time local deformation; Special tooling 2 is taken out, drives forging hammer to press to middle biscuit 1, under the effect of forging hammer and lower chopping block, the impression of middle biscuit 1 is disappeared completely, completes upper surface gathering stock.
In order to make bearing steel biscuit be out of shape dead band by end face local deformation, its deflection can be consistent with zone line, reaches 36% ~ 40%, and described special tooling to the depth of cup of middle biscuit is:
Wherein, H is the height of bar;
H
0for the height of middle biscuit;
σ, for being out of shape the ratio of volume shared by dead band during conventional deformation, gets 0.15 ~ 0.3.
Step 3: lower surface gathering stock.
Middle biscuit is turned, according to the operation of above-mentioned upper surface gathering stock, the other end of middle biscuit completes the gathering stock of lower surface, obtain bearing steel biscuit.
Claims (4)
1. a method for upsetting for bearing steel biscuit, is characterized in that, comprises the following steps:
Diameter be D, highly for the bearing steel bar of H is heated to forging temperature in forge furnace, after insulation a period of time; Bar is placed under forging press on chopping block, drive forging hammer downwards by bar jumping-up to being highly H
0=(0.60 ~ 0.64) H, its deflection is 36% ~ 40%, biscuit in the middle of obtaining;
Be disposed across on middle biscuit by special tooling through the center of middle biscuit, drive forging hammer to pressing down special tooling, special tooling forms first impression on middle biscuit, and the degree of depth of impression is h, completes first time local deformation; By special tooling after the center of middle biscuit is rotated counterclockwise 60 °, be disposed across on middle biscuit, drive forging hammer to pressing down special tooling, special tooling forms second impression on middle biscuit, and the degree of depth of impression is h, completes second time local deformation; Again by special tooling after the center of middle biscuit is rotated counterclockwise 60 °, be disposed across on middle biscuit, drive forging hammer to pressing down special tooling, special tooling forms the 3rd road impression on middle biscuit, and the degree of depth of impression is h, completes for the third time local deformation; Special tooling is taken out, drives forging hammer to press to middle biscuit, under the effect of forging hammer and lower chopping block, the impression of middle biscuit is disappeared completely, completes the gathering stock of upper surface;
Middle biscuit is turned, according to the operation of above-mentioned upper surface gathering stock, the other end of middle biscuit completes the gathering stock of lower surface, obtain bearing steel biscuit.
2. the method for upsetting of bearing steel biscuit according to claim 1, is characterized in that, described bearing steel is G20Cr2Ni4.
3. the method for upsetting of bearing steel biscuit according to claim 1 and 2, is characterized in that, described special tooling to the depth of cup of middle biscuit is:
Wherein, H is the height of bar;
H
0for the height of middle biscuit;
σ, for being out of shape the ratio of volume shared by dead band during conventional deformation, gets 0.15 ~ 0.3.
4. the method for upsetting of bearing steel biscuit according to claim 1 and 2, is characterized in that, described special tooling is bar, its width d=(0.2 ~ 0.3) D
0, wherein, D
0for the diameter of middle biscuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510868095.3A CN105522093A (en) | 2015-12-02 | 2015-12-02 | Upsetting method of bearing steel cake blank |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510868095.3A CN105522093A (en) | 2015-12-02 | 2015-12-02 | Upsetting method of bearing steel cake blank |
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| CN105522093A true CN105522093A (en) | 2016-04-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510868095.3A Pending CN105522093A (en) | 2015-12-02 | 2015-12-02 | Upsetting method of bearing steel cake blank |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62286640A (en) * | 1986-06-03 | 1987-12-12 | Nippon Steel Corp | Forging method for titanium alloy |
| CN103447431A (en) * | 2012-06-01 | 2013-12-18 | 鑫科材料科技股份有限公司 | Method for improving forming uniformity of flat die forging |
| JP2014168795A (en) * | 2013-03-01 | 2014-09-18 | Hitachi Metals Ltd | Mold for rotary forging |
-
2015
- 2015-12-02 CN CN201510868095.3A patent/CN105522093A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62286640A (en) * | 1986-06-03 | 1987-12-12 | Nippon Steel Corp | Forging method for titanium alloy |
| CN103447431A (en) * | 2012-06-01 | 2013-12-18 | 鑫科材料科技股份有限公司 | Method for improving forming uniformity of flat die forging |
| JP2014168795A (en) * | 2013-03-01 | 2014-09-18 | Hitachi Metals Ltd | Mold for rotary forging |
Non-Patent Citations (2)
| Title |
|---|
| 任猛等: "大型圆饼类件锻造及RST效应", 《大型铸锻件》 * |
| 韩静涛等: "控制大型饼类锻件夹杂性缺陷的镦粗成形工艺研究", 《大型铸锻件》 * |
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Application publication date: 20160427 |