CN103358097A - Process of utilizing waste bearing steel to manufacture die steel by quenching - Google Patents
Process of utilizing waste bearing steel to manufacture die steel by quenching Download PDFInfo
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- CN103358097A CN103358097A CN201310283408XA CN201310283408A CN103358097A CN 103358097 A CN103358097 A CN 103358097A CN 201310283408X A CN201310283408X A CN 201310283408XA CN 201310283408 A CN201310283408 A CN 201310283408A CN 103358097 A CN103358097 A CN 103358097A
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Abstract
The invention discloses process of utilizing waste bearing steel to manufacture a die steel by quenching, which comprises the following steps: a, sorting 3.6-4.6 kg stub bar tailings; b, forging into a cylindric blank with diameter of 55-65 millimetres and 180-220 millimetres by a pneumatic hammer; c, performing oxygen-free spheroidizing annealing; d, performing metal roughing; e, performing quenching and tempering; and f, performing metal finishing. The process has the advantages of relative low processing cost, very stable quality, and long service life. Moreover, the service life of the die steel can be as long as that of a core roller processed through the die steel 3Cr2W8V; the prepared die steel is low in cost, about 10 percent of a conventional die steel, as the cost of the waste bearing steel is about 50 percent of the 45 steel, and also realizes reutilization of waste materials.
Description
Technical field
The present invention relates to technical field of bearing processing, be specifically related to the technique that a kind of useless bearing steel by quenching is made mould steel.
Background technology
The bearing ring forging industry, particularly medium-and-large-sized bearing ring forges, and core roller as shown in Figure 1 etc. is main rapid wear mould, the main cause of damaging is oxidation or fractures, when hardness is low oxidation serious, core roller size decreases, product quality is influenced, easily fractures when hardness is high, changes frequent.Material and manufacture craft that the core roller adopts usually have two kinds: the one, adopt No. 45 the steel round bar, and finish the making of mould through operations such as cutting stock, metal roughing, Q-tempering, metal finish; Its characteristics are that processing cost is relatively on the low side, the process-cycle is short, but quality is extremely unstable, service life is very short.The 2nd, use mould steel 3Cr2W8V round bar, finish the making of mould through operations such as cutting stock, metal roughing, metal finish; Its characteristics are that the process-cycle is relatively partially short, and steady quality, service life are very long, but cost is high.
Summary of the invention
The object of the present invention is to provide a kind of useless bearing steel by quenching to make the technique of mould steel, reduced the dependence for finished product mould steel on the market, improve service property (quality) and the life-span of core roller, guarantee product quality, reduce labour intensity, enhance productivity, reduce enterprise's manufacturing cost, promoted the regeneration of social resources.
To achieve these goals, the technical scheme of the present invention's proposition is:
A kind of useless bearing steel by quenching is made the technique of mould steel, comprises the steps: a) to sub-elect 3.6～4.6 kilograms stub bar material tail; B) pneumatic hammer forges into the cylinder blank of 55～65 millimeters of diameters, 180～220 millimeters of length; C) anaerobic spheroidizing; D) metal roughing; E) Q-tempering; F) metal finish.Bearing steel described herein refers to high-carbon-chromium bearing steel GCr15.
Make the technique of mould steel as the further improved useless bearing steel by quenching of the present invention, described step c) anaerobic annealing process comprises the steps: A, is warming up to 720～740 ℃ with the speed of 43～52 ℃/h, B, at 720～740 ℃ of lower insulation 3.5～4.5h, C, be warming up to 780～800 ℃ with the speed of 20～30 ℃/h, D, at 780～800 ℃ of lower insulation 6.0～6.5h, E, be cooled to 720～740 ℃ with the speed of 20～30 ℃/h, F, at 720～740 ℃ of lower insulation 3.5～4.5h, G, be cooled to room temperature with the speed of 43～52 ℃/h.
Make the technique of mould steel as the further improved useless bearing steel by quenching of the present invention, described step e) Q-tempering technique is 830～850 ℃ of hardening heats, insulation 2～2.5h; 170～180 ℃ of temperatures, insulation 2～2.5h.
Useless bearing steel by quenching provided by the present invention is made the technique of mould steel, processing cost is relatively low, quality stabilizer pole, long service life, and can reach the service life of the core roller of mould steel 3Cr2W8V processing, cost is low, useless bearing steel price only has 50% of No. 45 steel prices, 10% of mould steel price has realized the regeneration of waste and old material.
Description of drawings
Fig. 1, the common structure schematic diagram of core roller (long measure of dimensioning is millimeter among the figure);
Fig. 2, anaerobic annealing process schematic diagram (numeral of time shaft mark is the duration of each step among the figure).
The specific embodiment
In order to deepen the understanding of the present invention, below in conjunction with embodiment the present invention is done to describe in further detail, this embodiment only is used for explaining the present invention, does not consist of the restriction to protection domain of the present invention.
The useless bearing steel by quenching that the present embodiment provides is made the technique of mould steel, comprises the steps:
A) sub-elect 3.6～4.6 kilograms stub bar material tail;
B) pneumatic hammer forges into the cylinder blank of 55～65 millimeters of diameters, 180～220 millimeters of length;
C) anaerobic spheroidizing: A, be warming up to 720～740 ℃ with the speed of 43～52 ℃/h, B, at 720～740 ℃ of lower insulation 3.5～4.5h, C, be warming up to 780～800 ℃ with the speed of 20～30 ℃/h, D, at 780～800 ℃ of lower insulation 6.0～6.5h, E, be cooled to 720～740 ℃ with the speed of 20～30 ℃/h, F, at 720～740 ℃ of lower insulation 3.5～4.5h, G, be cooled to room temperature with the speed of 43～52 ℃/h;
D) metal roughing;
E) Q-tempering: 830～850 ℃ of hardening heats, insulation 2～2.5h; 170～180 ℃ of temperatures, insulation 2～2.5h;
F) metal finish.
Make the core roller of the technique making of mould steel according to the useless bearing steel by quenching that the present embodiment provides, the core roller of its service life and mould steel 3Cr2W8V processing is suitable.
Claims (3)
1. a useless bearing steel by quenching is made the technique of mould steel, it is characterized in that: comprise the steps: a) to sub-elect 3.6～4.6 kilograms stub bar material tail; B) pneumatic hammer forges into the cylinder blank of 55～65 millimeters of diameters, 180～220 millimeters of length; C) anaerobic spheroidizing; D) metal roughing; E) Q-tempering; F) metal finish.
2. useless bearing steel by quenching according to claim 1 is made the technique of mould steel, it is characterized in that: described step c) anaerobic annealing process comprises the steps: A, is warming up to 720～740 ℃ with the speed of 43～52 ℃/h, B, at 720～740 ℃ of lower insulation 3.5～4.5h, C, be warming up to 780～800 ℃ with the speed of 20～30 ℃/h, D, at 780～800 ℃ of lower insulation 6.0～6.5h, E, be cooled to 720～740 ℃ with the speed of 20～30 ℃/h, F, at 720～740 ℃ of lower insulation 3.5～4.5h, G, be cooled to room temperature with the speed of 43～52 ℃/h.
3. useless bearing steel by quenching according to claim 1 is made the technique of mould steel, it is characterized in that: described step e) Q-tempering technique is 830～850 ℃ of hardening heats, insulation 2～2.5h; 170～180 ℃ of temperatures, insulation 2～2.5h.
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| CN201310283408.XA CN103358097B (en) | 2013-07-08 | 2013-07-08 | Useless bearing steel by quenching makes the technique of mould steel |
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| CN201310283408.XA CN103358097B (en) | 2013-07-08 | 2013-07-08 | Useless bearing steel by quenching makes the technique of mould steel |
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| CN103358097A true CN103358097A (en) | 2013-10-23 |
| CN103358097B CN103358097B (en) | 2015-10-28 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0257632A (en) * | 1988-08-24 | 1990-02-27 | Nippon Steel Corp | Manufacture of die steel excellent in thermal fatigue characteristic |
| CN1287183A (en) * | 2000-07-12 | 2001-03-14 | 董元宇 | Bearing steel suitable for the working condition of heavy load and great shock and its heat treatment process |
| JP2008121032A (en) * | 2006-11-08 | 2008-05-29 | Daido Steel Co Ltd | Die steel superior in spheroidizing annealing property and hardenability |
| US20080264526A1 (en) * | 2007-04-27 | 2008-10-30 | Daido Tokushuko Kabushiki Kaisha | Hot working die steel for die-casting |
| CN202175701U (en) * | 2011-08-05 | 2012-03-28 | 瓦房店轴承集团有限责任公司 | Novel quenching mold for carburizing steel bearing ring |
| CN102601597A (en) * | 2012-04-01 | 2012-07-25 | 株洲春华实业有限责任公司 | Machining process for railway riveting fastener molds |
-
2013
- 2013-07-08 CN CN201310283408.XA patent/CN103358097B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0257632A (en) * | 1988-08-24 | 1990-02-27 | Nippon Steel Corp | Manufacture of die steel excellent in thermal fatigue characteristic |
| CN1287183A (en) * | 2000-07-12 | 2001-03-14 | 董元宇 | Bearing steel suitable for the working condition of heavy load and great shock and its heat treatment process |
| JP2008121032A (en) * | 2006-11-08 | 2008-05-29 | Daido Steel Co Ltd | Die steel superior in spheroidizing annealing property and hardenability |
| US20080264526A1 (en) * | 2007-04-27 | 2008-10-30 | Daido Tokushuko Kabushiki Kaisha | Hot working die steel for die-casting |
| CN202175701U (en) * | 2011-08-05 | 2012-03-28 | 瓦房店轴承集团有限责任公司 | Novel quenching mold for carburizing steel bearing ring |
| CN102601597A (en) * | 2012-04-01 | 2012-07-25 | 株洲春华实业有限责任公司 | Machining process for railway riveting fastener molds |
Non-Patent Citations (1)
| Title |
|---|
| 胡亚民 等: ""用轴承钢制作冷摆辗模具芯块及相应措施"", 《机械工人（热加工）》, no. 8, 9 August 2004 (2004-08-09), pages 101 - 103 * |
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| CN103358097B (en) | 2015-10-28 |
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Effective date of registration: 20170417 Address after: 241000 Anhui city of Wuhu province Fanchang County Economic Development Zone Patentee after: Wuhu Chang Chang Bearing Co., Ltd. Address before: Wuhu City, Anhui Province, Fanchang County Industrial Park, 241200 No. 13 Patentee before: Wuhu Mingyuan Bearing Forging Co., Ltd. |