CN102814439A - Hot-forging molding process of large-sized stainless steel nut - Google Patents
Hot-forging molding process of large-sized stainless steel nut Download PDFInfo
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- CN102814439A CN102814439A CN2012103305163A CN201210330516A CN102814439A CN 102814439 A CN102814439 A CN 102814439A CN 2012103305163 A CN2012103305163 A CN 2012103305163A CN 201210330516 A CN201210330516 A CN 201210330516A CN 102814439 A CN102814439 A CN 102814439A
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- stainless steel
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- burnishing
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Abstract
The invention relates to a large-sized stainless steel nut, and in particular relates to a hot-forging molding process of the large-sized stainless steel nut. The hot-forging molding process comprises the following steps of: (1) preheating: preheating stainless steel raw materials in a high-power induction heating furnace until the temperature reaches 700-950 DEG C; (2) heating: continuously heating the stainless steel raw materials preheated in the step (1) until the temperature reaches 950-1100 DEG C; (3) forging: forging the raw materials heated in the step (2) on a forging press, and forming nuts, wherein the outer surface of the nut is rough and in a certain shape, and the inner hole of the nut is round; (4) shot blasting: carrying out shot blasting on workpieces forged in the step (3) in a shot blasting machine, and washing the residual oxide skins on the surfaces; and (5) burnishing: carrying out burnishing processing on the workpieces which are subjected to shot blasting in the step (4), and forming large-sized stainless steel nuts having certain shapes and luminous outer surfaces. According to the hot-forging molding process of the large-sized stainless steel nut, the process is simple, a hot forging molding effect is good, and the performance of the nut is excellent.
Description
Technical field
The present invention relates to a kind of big specification stainless steel nut, especially relate to a kind of hot-forging forming technology of big specification stainless steel nut.
Background technology
Along with Chinese accession to the WTO; Overall national strength is strengthened day by day, and the main equipment manufacturing is domesticized day by day, also brings new opportunity to Investment in fastener industry simultaneously; Particularly in the last few years, it is very huge to be applied in the petrochemical industry equipment high temperature resistant, high pressure resistant, corrosion resistant nut demand.Owing to limited by domestic equipment, the cold pressed nut size is M24 to the maximum, with top nut, can only adopt technologies such as traditional plane mills, turning for M24, and waste of material is big, and the process-cycle is long, and outward appearance is coarse.Therefore, those skilled in the art are badly in need of developing a kind of big specification stainless steel nut hot-forging forming technology.
Summary of the invention
For solving above-mentioned deficiency of the prior art, the invention provides a kind of big specification stainless steel nut hot-forging forming technology, can the speed production cycle; Make full use of the stainless steel material characteristic simultaneously; Realize the combination property of product fine, also energy savings greatly reduces production costs simultaneously.
For realizing above-mentioned purpose, technical scheme of the present invention is following:
A kind of big specification stainless steel nut hot-forging forming technology may further comprise the steps:
(1), preheating: the stainless steel raw material is preheated to 700 ℃-950 ℃ in high-power induction heater;
(2), heating: the stainless steel raw material that preheating in the step (1) is accomplished continues to be heated to 950 ℃-1100 ℃;
(3), forge: the raw material that heating in the step (2) is accomplished forges on forging press, and forming the coarse and profile of outer surface is that definite shape, endoporus are circular nut;
(4), ball blast: the workpiece that forges completion in the step (3) is carried out ball blast in shot-blasting machine, wash away surperficial remaining oxide skin;
(5), burnishing-in: the workpiece of accomplishing ball blast in the step (4) is carried out burnishing-in processing, form the big specification stainless steel nut of shiny outer surface with definite shape.
Described stainless steel raw material tries to forge after preheating.
Forging in the described step (3) on the 200T forging press, carrying out outer surface and the endoporus one-shot forming forges.
Burnishing-in in the described step (5) is the lubricated burnishing-in of outer surface.
The lubricated burnishing-in of described outer surface is the cold extrusion burnishing-in.
High-power induction heater in the described step (1) is a Medium Frequency Induction Heating Furnace.
Shape in described step (3) and (5) is hexagon.
Beneficial effect of the present invention is following:
1, the present invention adopts high-power induction heater, easy control of temperature, heating-up temperature height to be controlled at 50 ℃ when preheating and heating; And heat time heating time is short, and the stainless steel raw material is burnt braised in soy sauce only passing through to be needed about 30S, and can realize forging continuously operation; Blanking time about 3-4S; The surface of the work oxidation is few, can at utmost guarantee its appearance light, helps the external beauty of product.
2, because stainless steel toughness substantially exceeds other steel grade, so use the 200T forging press when forging, adopt outer-hexagonal and endoporus one-shot forming technique, processing step is reduced, reduce processing malleableize phenomenon.
3, when burnishing-in, adopt cold extrusion processing, accurate outer-hexagonal shape size, shiny outer surface, and can improve product strength greatly.
4, the time carry out preheating in heating, after preheating, try to forge, avoided the stainless steel raw material phenomenons such as overheated, cracking, the comprehensive mechanical performance after having guaranteed to forge when forging, to occur.
The specific embodiment
Below in conjunction with specific embodiment the present invention is described further, but protection scope of the present invention is not limited to this.
Embodiment 1
Big specification stainless steel nut hot-forging forming technology of the present invention may further comprise the steps:
(1), preheating: the stainless steel raw material is preheated to 850 ℃ in Medium Frequency Induction Heating Furnace; Try to forge after preheating is accomplished, observe the raw material surface and defectives such as overheated, crack whether occur, adjust forging parameter, the comprehensive mechanical performance after guaranteeing to forge according to actual conditions;
(2), heating: the stainless steel raw material that preheating in the step (1) is accomplished continues to be heated to 1020 ℃, is about 15S heat time heating time, and can burn braised in soy sauce passing through this moment with raw material;
(3), forge: (parameter of concrete nut is all different adjusting parameter with heating the raw material of accomplishing in the step (2); Adjust concrete parameter as the case may be) the 200T forging press on carry out the outer-hexagonal surface and the endoporus one-shot forming forges; The formation outer surface is that hexagon, endoporus are circular nut, and the nut outer surface of this moment is coarse;
(4), ball blast: the workpiece that forges completion in the step (3) is carried out ball blast in shot-blasting machine, wash away surperficial remaining oxide skin,, also make surface of the work produce sclerosis, guarantee that the product light is attractive in appearance owing to use shot to impact surface of the work in the process of ball blast;
(5), burnishing-in: the outer-hexagonal face of accomplishing the workpiece of ball blast in the step (4) is carried out the lubricated burnishing-in processing of cold extrusion, and making profile is the big specification stainless steel nut of hexagonal shiny outer surface.
Embodiment 2
Big specification stainless steel nut hot-forging forming technology of the present invention may further comprise the steps:
(1), preheating: the stainless steel raw material is preheated to 950 ℃ in Medium Frequency Induction Heating Furnace; Try to forge after preheating is accomplished, observe the raw material surface and defectives such as overheated, crack whether occur, adjust forging parameter, the comprehensive mechanical performance after guaranteeing to forge according to actual conditions;
(2), heating: the stainless steel raw material that preheating in the step (1) is accomplished continues to be heated to 1100 ℃, is about 20S heat time heating time, and can burn braised in soy sauce passing through this moment with raw material;
(3), forge: (parameter of concrete nut is all different adjusting parameter with heating the raw material of accomplishing in the step (2); Adjust concrete parameter as the case may be) the 200T forging press on carry out the outer-hexagonal surface and the endoporus one-shot forming forges; The formation outer surface is that hexagon, endoporus are circular nut, and the nut outer surface of this moment is coarse;
(4), ball blast: the workpiece that forges completion in the step (3) is carried out ball blast in shot-blasting machine, wash away surperficial remaining oxide skin,, also make surface of the work produce sclerosis, guarantee that the product light is attractive in appearance owing to use shot to impact surface of the work in the process of ball blast;
(5), burnishing-in: the outer-hexagonal face of accomplishing the workpiece of ball blast in the step (4) is carried out the lubricated burnishing-in processing of cold extrusion, and making profile is the big specification stainless steel nut of hexagonal shiny outer surface.
Embodiment 3
Big specification stainless steel nut hot-forging forming technology of the present invention may further comprise the steps:
(1), preheating: the stainless steel raw material is preheated to 700 ℃ in Medium Frequency Induction Heating Furnace; Try to forge after preheating is accomplished, observe the raw material surface and defectives such as overheated, crack whether occur, adjust forging parameter, the comprehensive mechanical performance after guaranteeing to forge according to actual conditions;
(2), heating: the stainless steel raw material that preheating in the step (1) is accomplished continues to be heated to 950 ℃, is about 7S heat time heating time, and can burn braised in soy sauce passing through this moment with raw material;
(3), forge: (parameter of concrete nut is all different adjusting parameter with heating the raw material of accomplishing in the step (2); Adjust concrete parameter as the case may be) the 200T forging press on carry out the outer-hexagonal surface and the endoporus one-shot forming forges; The formation outer surface is that hexagon, endoporus are circular nut, and the nut outer surface of this moment is coarse;
(4), ball blast: the workpiece that forges completion in the step (3) is carried out ball blast in shot-blasting machine, wash away surperficial remaining oxide skin,, also make surface of the work produce sclerosis, guarantee that the product light is attractive in appearance owing to use shot to impact surface of the work in the process of ball blast;
(5), burnishing-in: the outer-hexagonal face of accomplishing the workpiece of ball blast in the step (4) is carried out the lubricated burnishing-in processing of cold extrusion, and making profile is the big specification stainless steel nut of hexagonal shiny outer surface.
Performance test
The big specification stainless steel nut that makes among the foregoing description 1-3 is carried out chemical analysis detection, stress detection and hardness detect, detection method is following:
1, chemical analysis detects:
Utilize the content range of each element of hand-held spectrophotometer, test result sees the following form 1.
Table 1
| Embodiment | C | S | P | Cr | Ni | Mn | Si |
| Embodiment 1 | 0.07 | 0.015 | 0.021 | 19.21 | 8.74 | 1.07 | 0.80 |
| Embodiment 2 | 0.05 | 0.020 | 0.020 | 19.25 | 8.56 | 1.13 | 0.85 |
| Embodiment 3 | 0.08 | 0.021 | 0.020 | 19.30 | 8.93 | 1.09 | 0.78 |
2, stress detects:
Nut sleeve is carried out stress detect on universal testing machine, test result sees the following form 2.
Table 2
| ? | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| Stress (N/MM 2） | 500 | 500 | 500 |
3, hardness detects:
Hardness detects carries out on hardometer; Room temperature during detection is 23 ℃; The detection bulb diameter is 2.5D/mm, and the ratio 0.102Xf/D of detection power-pressure head bulb diameter square is 30, and detection power is 1839F/N; During detection big specification stainless steel nut firmly is positioned on the rigid support thing, should cleans and not have extraneous dirt (like oxide skin, oil, dust etc.) between the nut back side and the supporter.
Pressure head contacts with the nut surface; Do not have to impact and quaveringly apply detection power perpendicular to the nut surface, until reaching 1839F/N, from reinforcing begin to the time that has applied detection power should be between 5s; Detection time of holding of trying hard to keep is 13s, and the allowable error of retention time is ± 2s.
In whole testing process, the impact of the unaffected testing result of hardometer and vibrations; The distance at arbitrary impression centre-to-centre spacing nut edge is at least 2.5 times of impression average diameter, and two adjacent indentations distances between centers are at least 3 times of impression average diameter.Measure impression diameter in two mutual vertical direction, with the mean value calculation hardness of two readings.Testing result sees the following form 3.
Table 3
| ? | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| Hardness HB | 187 | 185 | 190 |
Big specification stainless steel nut hot-forging forming technology of the present invention is applicable to the nut of any stainless steel material, and the hot-forging forming technology of the stainless steel material nut among the hot-forging forming technology of other stainless steel material nut and the embodiment 1-3 is the same, does not give unnecessary details here.
In sum, big specification stainless steel nut hot-forging forming technology process of the present invention is simple, and its nut superior performance.
The foregoing description only is used to the inventive concept of the present invention of explaining, but not to the qualification of rights protection of the present invention, allly utilizes this design that the present invention is carried out the change of unsubstantiality, all should fall into protection scope of the present invention.
Claims (7)
1. one kind big specification stainless steel nut hot-forging forming technology is characterized in that may further comprise the steps:
(1), preheating: the stainless steel raw material is preheated to 700 ℃-950 ℃ in high-power induction heater;
(2), heating: the stainless steel raw material that preheating in the step (1) is accomplished continues to be heated to 950 ℃-1100 ℃;
(3), forge: the raw material that heating in the step (2) is accomplished forges on forging press, and forming the coarse and outer surface of outer surface is that definite shape, endoporus are circular workpiece;
(4), ball blast: the workpiece that forges completion in the step (3) is carried out ball blast in shot-blasting machine, wash away surperficial remaining oxide skin;
(5), burnishing-in: the workpiece of accomplishing ball blast in the step (4) is carried out burnishing-in processing, form the big specification stainless steel nut of shiny outer surface with definite shape.
2. hot-forging forming technology as claimed in claim 1 is characterized in that: described stainless steel raw material tries to forge after preheating.
3. hot-forging forming technology as claimed in claim 1 is characterized in that: forging on the 200T forging press, carrying out outer surface and the endoporus one-shot forming forges in the described step (3).
4. hot-forging forming technology as claimed in claim 1 is characterized in that: the burnishing-in in the described step (5) is the lubricated burnishing-in of outer surface.
5. hot-forging forming technology as claimed in claim 4 is characterized in that: the lubricated burnishing-in of described outer surface is the cold extrusion burnishing-in.
6. hot-forging forming technology as claimed in claim 1 is characterized in that: the high-power induction heater in the described step (1) is a Medium Frequency Induction Heating Furnace.
7. hot-forging forming technology as claimed in claim 1 is characterized in that: the shape in described step (3) and (5) is hexagon.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012103305163A CN102814439A (en) | 2012-09-10 | 2012-09-10 | Hot-forging molding process of large-sized stainless steel nut |
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| CN2012103305163A CN102814439A (en) | 2012-09-10 | 2012-09-10 | Hot-forging molding process of large-sized stainless steel nut |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107178552A (en) * | 2017-06-05 | 2017-09-19 | 嘉兴新亚汽车零部件有限公司 | A kind of heavy truck rear-wheel hub locking nut and its production technology |
| CN107299295A (en) * | 2017-06-08 | 2017-10-27 | 上海威克迈龙川汽车发动机零件有限公司 | The moulding process of the oily rail of super-pressure stainless steel forging and stamping |
| CN109277512A (en) * | 2018-11-07 | 2019-01-29 | 浙江金波减震器制造有限公司 | A kind of shock damper bottom seal structure and its sealing process |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6558263B1 (en) * | 2001-11-02 | 2003-05-06 | Mitsuru Matsuyama | Forging method of a hollow part |
| CN101539163A (en) * | 2008-03-19 | 2009-09-23 | 洛阳双瑞特钢科技有限公司 | Manufacturing method and safety evaluation method of anti-delayed fracture 16.9 grade bolt |
| CN101767179A (en) * | 2009-12-31 | 2010-07-07 | 上海新闵重型锻造有限公司 | Method for forging screw and nut |
| CN102319846A (en) * | 2011-06-20 | 2012-01-18 | 重庆创精温锻成型有限公司 | Method for forming precision forging billet of output spline shaft of automobile automatic transmission |
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2012
- 2012-09-10 CN CN2012103305163A patent/CN102814439A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6558263B1 (en) * | 2001-11-02 | 2003-05-06 | Mitsuru Matsuyama | Forging method of a hollow part |
| CN101539163A (en) * | 2008-03-19 | 2009-09-23 | 洛阳双瑞特钢科技有限公司 | Manufacturing method and safety evaluation method of anti-delayed fracture 16.9 grade bolt |
| CN101767179A (en) * | 2009-12-31 | 2010-07-07 | 上海新闵重型锻造有限公司 | Method for forging screw and nut |
| CN102319846A (en) * | 2011-06-20 | 2012-01-18 | 重庆创精温锻成型有限公司 | Method for forming precision forging billet of output spline shaft of automobile automatic transmission |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107178552A (en) * | 2017-06-05 | 2017-09-19 | 嘉兴新亚汽车零部件有限公司 | A kind of heavy truck rear-wheel hub locking nut and its production technology |
| CN107299295A (en) * | 2017-06-08 | 2017-10-27 | 上海威克迈龙川汽车发动机零件有限公司 | The moulding process of the oily rail of super-pressure stainless steel forging and stamping |
| CN107299295B (en) * | 2017-06-08 | 2018-10-09 | 上海威克迈龙川汽车发动机零件有限公司 | The moulding process of the oily rail of super-pressure stainless steel forging and stamping |
| CN109277512A (en) * | 2018-11-07 | 2019-01-29 | 浙江金波减震器制造有限公司 | A kind of shock damper bottom seal structure and its sealing process |
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Application publication date: 20121212 |