CN102527897A - Forging method for thin-walled step short sleeve type main shaft flange of water turbine - Google Patents
Forging method for thin-walled step short sleeve type main shaft flange of water turbine Download PDFInfo
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Abstract
A forging method for a thin-walled step short sleeve type main shaft flange of a water turbine is characterized in that both the physical dimension and internal quality of a forge piece can be allowed for in an overall free-shaped forging way of combining upsetting and stretching. The forging method comprises the technological processes of upsetting, stretching, baiting, upsetting, punching, broaching, stretching with a core bar, pressing out a step, and finishing until the dimension of the forge piece conforms to the process dimension. By adoption of the method, the integrity of metal streamline of the forge piece in the following processing procedures is ensured, and finally the mechanical properties of parts are greatly improved. Compared with the prior well-known method, the forging method provided by the invention has the advantages that the utilization ratio of material is greatly improved, the amount of following mechanical processing is reduced, the production cost is reduced, and the production efficiency is increased.
Description
Technical field
The invention belongs to the forging field of spindle flange, relate to the forging method of the short cover type spindle flange of a kind of hydraulic turbine thin-walled step specifically.
Background technology
Main shaft of large water turbine is one of critical piece of hydro-electric power generating equipment, and spindle flange forging wherein is owing to have step, structure as shown in Figure 1; As the short cover of thin-walled step forging; Its length dimension is merely about half of diameter, and is shorter relatively, and the forging difficulty is very big.Therefore, under normal conditions, this forging adopts and adds dressing, with the form forging and molding of circle forging shown in Figure 2.This kind Forging Technology has reduced the forging manufacture difficulty greatly, but also exists two large problems described below:
1, for the bigger lower flange part of step; Forge the weight and the workload of forging back machining that have increased forging for the circle forging greatly; Cause the huge waste and the prolongation in part processing cycle on the material use, and then also caused being multiplied of production cost.
2, forge to cutting off the metal streamline of forging in the machining process behind the circle forging, cause forging whole, especially the axial mechanical property of flange section reduces greatly.
Summary of the invention
The objective of the invention is deficiency for solving the problems of the technologies described above; The forging method of the short cover type spindle flange of a kind of hydraulic turbine thin-walled step is provided, saves material, reduce production costs; Enhance productivity; And this technology when having avoided following process to the destruction of forging metal streamline, thereby improved forging greatly, especially the flange position comprehensive mechanical property.
The present invention is the deficiency that solves the problems of the technologies described above, and the technical scheme that is adopted is: the forging method of the short cover type spindle flange of a kind of hydraulic turbine thin-walled step, and it is characterized in that: concrete steps are following:
Step 1, employing steel ingot carry out jumping-up through forging press to steel ingot as raw material, and the jumping-up drafts is 50%～70% of a steel ingot ingot height degree; The back pulling, the ratio of length is between 2.0～2.2 before length after the pulling and the pulling, and the back cuts off blanking;
Step 2, the blank jumping-up after step 1 handled are to forging ' s block dimension, and the punching pin punching is adopted in the back, and is subsequent use;
Step 3, saddle is penetrated the blank endoporus, on saddle, blank is carried out round as a ball reaming, the ratio of diameter is between 1.2～1.35 before diameter after the reaming and the reaming;
Step 4, in blank, penetrate plug, adopt the upper and lower V-type anvil of symmetry that blank is pulled out to required size, then blank is extruded step surface;
Step 5, finishing to forging process complete.
Wherein in the step 4 conformal behind the blank Ka Tai forged and be short cover forging with the level, compare in the past part added to forge behind the dressing and be the circle forging, can improve the utilization rate of material greatly and keep the metal streamline of forging preferably.And, adopt the upper and lower V-type anvil pulling of symmetry can effectively reduce the generation of the end face irregularity phenomenon of bringing because of metal flow is inhomogeneous, and can guarantee the compacting that forging is inner better because forging length is shorter.
The material that blank of the present invention adopts electric furnace steel making and carries out vacuum outgas.
The invention has the beneficial effects as follows:
The free forging method of the forging that the present invention proposes; Overcome the defective of known technology existence in the past, in forging process, taken all factors into consideration the deformation extent of forging, accomplished that distortion evenly; Streamline is continuous; Outward appearance is clean and tidy, and the deformation tendency of whole forming process is that jumping-up combines with pulling, has following characteristics and advantage:
1, the present invention is owing to be through whole conformal forging and molding; Compared and lacked a large amount of dressing be swaged into the circle forging in the past, forge weight alleviates greatly, and stock utilization has obtained bigger lifting; Follow-up machining amount also significantly reduces simultaneously, has reduced production cost and cycle on the whole.
2, the present invention has been owing to adopted the method for conformal forging and molding, when having avoided following process to the destruction of forging metal streamline, thereby improved forging greatly, especially the flange position comprehensive mechanical property.
3, the present invention in the end one adopted upper and lower symmetrical V-type anvil plug pulling when walking out of finished product method, the end face irregularity phenomenon from having avoided asymmetric anvil type to bring because of metal flow is inhomogeneous has to the full extent reduced the spillage of material of forging length direction.
Description of drawings
Fig. 1 is the whole conformal forging drawing of the short cover type spindle flange of hydraulic turbine thin-walled step among the present invention;
Fig. 2 adds the dressing forging drawing for the short cover type spindle flange of hydraulic turbine thin-walled step of the prior art;
Fig. 3 is the forging flow chart of the short cover type spindle flange of hydraulic turbine thin-walled step of the present invention.
The specific embodiment
As shown in Figure 3, the forging method of the short cover type spindle flange of a kind of hydraulic turbine thin-walled step, concrete steps are following:
Step 1, employing steel ingot carry out jumping-up through forging press to steel ingot as raw material, and the jumping-up drafts is 50%～70% of a steel ingot ingot height degree; The back pulling; The ratio of length is between 2.0～2.2 before length after the pulling and the pulling; The back cuts off blanking; Cut off blanking and be section, forging two ends, the height of blank and the ratio of diameter should be controlled between 1.8～2.0 after jumping-up, pulling, and the purpose of this step is that the abundant forging that guarantees forging is passed through;
Step 2, the blank jumping-up after step 1 handled are to forging ' s block dimension, and the punching pin punching is adopted in the back, and is subsequent use;
Step 3, saddle is penetrated the blank endoporus, on saddle, blank is carried out round as a ball reaming, the ratio of diameter is between 1.2～1.35 before diameter after the reaming and the reaming;
Step 4, in blank, penetrate plug, adopt the upper and lower V-type anvil of symmetry that blank is pulled out to required size, then blank is extruded step surface;
Step 5, finishing to forging process complete.
Wherein, can adopt than the small punch punching in the step 2, and in step 3, adopt suitable saddle to carry out hole dimension in reaming to the forging, can reduce like this to dash and take off weight, further increase stock utilization, reduce production costs.
Adopt the upper and lower V-type anvil pulling of symmetry not only can improve pulling efficient in the step 4,5; Also can effectively avoid the end face irregularity phenomenon brought because of metal flow is inhomogeneous; Thereby reduced the spillage of material of forging length direction, and can guarantee the compacting that forging is inner better.
Embodiment one: the forging method of the short cover type spindle flange of a kind of hydraulic turbine thin-walled step, and concrete steps are following:
Step 1, employing steel ingot carry out jumping-up through forging press to steel ingot as raw material, and the jumping-up drafts is 50% of a steel ingot ingot height degree; The back pulling, the ratio of length is between 2.2 before length after the pulling and the pulling, and the back cuts off blanking;
Step 2, the blank jumping-up after step 1 handled are to forging ' s block dimension, and the punching pin punching is adopted in the back, and is subsequent use;
Step 3, saddle is penetrated the blank endoporus, on saddle, blank is carried out round as a ball reaming, the ratio of diameter is between 1.2 before diameter after the reaming and the reaming;
Step 4, in blank, penetrate plug, adopt the upper and lower V-type anvil of symmetry that blank is pulled out to required size, then blank is extruded step surface;
Step 5, the size after handling according to step 4 and the gap of technological requirement size, the choose reasonable apparatus processing, for example cylindrical grinding and endoporus or the like complete.
Embodiment two: the forging method of the short cover type spindle flange of a kind of hydraulic turbine thin-walled step, and concrete steps are following:
Step 1, employing steel ingot carry out jumping-up through forging press to steel ingot as raw material, and the jumping-up drafts is 60% of a steel ingot ingot height degree; The back pulling, the ratio of length is between 2.0 before length after the pulling and the pulling, and the back cuts off blanking;
Step 2, the blank jumping-up after step 1 handled are to forging ' s block dimension, and the punching pin punching is adopted in the back, and is subsequent use;
Step 3, saddle is penetrated the blank endoporus, on saddle, blank is carried out round as a ball reaming, the ratio of diameter is between 1.25 before diameter after the reaming and the reaming;
Step 4, in blank, penetrate plug, adopt the upper and lower V-type anvil of symmetry that blank is pulled out to required size, then blank is extruded step surface;
Step 5, finishing to forging process complete.
Embodiment three: the forging method of the short cover type spindle flange of a kind of hydraulic turbine thin-walled step, and concrete steps are following:
Step 1, employing steel ingot carry out jumping-up through forging press to steel ingot as raw material, and the jumping-up drafts is 70% of a steel ingot ingot height degree; The back pulling, the ratio of length is between 2.1 before length after the pulling and the pulling, and the back cuts off blanking;
Step 2, the blank jumping-up after step 1 handled are to forging ' s block dimension, and the punching pin punching is adopted in the back, and is subsequent use;
Step 3, saddle is penetrated the blank endoporus, on saddle, blank is carried out round as a ball reaming, the ratio of diameter is between 1.35 before diameter after the reaming and the reaming;
Step 4, in blank, penetrate plug, adopt the upper and lower V-type anvil of symmetry that blank is pulled out to required size, then blank is extruded step surface;
Step 5, finishing to forging process complete.
Claims (1)
1. a hydraulic turbine thin-walled step is lacked the forging method that overlaps type spindle flange, and it is characterized in that: concrete steps are following:
Step 1, employing steel ingot carry out jumping-up through forging press to steel ingot as raw material, and the jumping-up drafts is 50%～70% of a steel ingot ingot height degree; The back pulling, the ratio of length is between 2.0～2.2 before length after the pulling and the pulling, and the back cuts off blanking;
Step 2, the blank jumping-up after step 1 handled are to forging ' s block dimension, and the punching pin punching is adopted in the back, and is subsequent use;
Step 3, saddle is penetrated the blank endoporus, on saddle, blank is carried out round as a ball reaming, the ratio of diameter is between 1.2～1.35 before diameter after the reaming and the reaming;
Step 4, in blank, penetrate plug, adopt the upper and lower V-type anvil of symmetry that blank is pulled out to required size, then blank is extruded step surface;
Step 5, finishing to forging process complete.
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| CN201110462380.7A CN102527897B (en) | 2011-12-30 | 2011-12-30 | Forging method for thin-walled step short sleeve type main shaft flange of water turbine |
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| CN201110462380.7A CN102527897B (en) | 2011-12-30 | 2011-12-30 | Forging method for thin-walled step short sleeve type main shaft flange of water turbine |
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| CN102527897B CN102527897B (en) | 2015-06-10 |
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| CN103212949A (en) * | 2013-04-19 | 2013-07-24 | 无锡宏达重工股份有限公司 | Oblate flange complete fiber forging technology |
| CN103691857A (en) * | 2014-01-10 | 2014-04-02 | 中信重工机械股份有限公司 | Method for forging isotropous rectangular shaft forging |
| CN104338882A (en) * | 2013-08-07 | 2015-02-11 | 上海重型机器厂有限公司 | Forming method of motor enclosure forging of third-generation nuclear power coolant pump |
| CN104550595A (en) * | 2015-01-14 | 2015-04-29 | 重庆焱炼重型机械设备股份有限公司 | Bush forging technology |
| CN105345410A (en) * | 2015-12-02 | 2016-02-24 | 四川民盛特钢锻造有限公司 | Forging method of special-shaped forged piece of thermal power unit filter screen main body |
| CN105880442A (en) * | 2016-05-05 | 2016-08-24 | 中信重工机械股份有限公司 | Hollow shrinking forming method for sleeve type forge piece |
| CN106077386A (en) * | 2016-06-20 | 2016-11-09 | 安徽省瑞杰锻造有限责任公司 | A kind of Forging Technology of large-scale interior outer step barrel shape forging |
| CN108213294A (en) * | 2017-12-20 | 2018-06-29 | 中原特钢股份有限公司 | A kind of half-blind hole forging batter forging method |
| WO2019010866A1 (en) * | 2017-07-13 | 2019-01-17 | 江阴南工锻造有限公司 | Long valve body punching, elongating, and forging process |
| CN109834211A (en) * | 2017-11-28 | 2019-06-04 | 上海电气上重铸锻有限公司 | The forging forming method of special-shaped barrel |
| CN111055090A (en) * | 2019-12-09 | 2020-04-24 | 东台市润丰法兰制造有限公司 | Flange shaft precision forming process |
| CN111069492A (en) * | 2019-12-31 | 2020-04-28 | 中钢集团邢台机械轧辊有限公司 | Cold-type blank forging method for centrifugal machine |
| CN111822634A (en) * | 2020-05-26 | 2020-10-27 | 洛阳中重铸锻有限责任公司 | Shape control method for improving homogeneity of die steel |
| CN112846018A (en) * | 2021-01-05 | 2021-05-28 | 洛阳中重铸锻有限责任公司 | Free forging forming method of hollow forging with stepped inner hole |
| CN113770290A (en) * | 2021-09-08 | 2021-12-10 | 河南中原特钢装备制造有限公司 | Forging method of large-size high-utilization-rate red copper thin-wall hollow pipe |
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| CN104338882B (en) * | 2013-08-07 | 2016-08-10 | 上海重型机器厂有限公司 | The forming method of generation Ⅲ nuclear power cooling medium pump motor casing forging |
| CN104338882A (en) * | 2013-08-07 | 2015-02-11 | 上海重型机器厂有限公司 | Forming method of motor enclosure forging of third-generation nuclear power coolant pump |
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| CN106077386B (en) * | 2016-06-20 | 2019-08-09 | 安徽省瑞杰锻造有限责任公司 | It is a kind of large size in outer step barrel shape forging forging technology |
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Inventor after: Ji Ligong Inventor after: Xu Hangtao Inventor after: Zhang Siwei Inventor after: Ruan Xin Inventor after: Xue Qiuyun Inventor after: Zhang Lianzhen Inventor after: Song Yubing Inventor after: Sun Tonghui Inventor after: Li Changyi Inventor after: Qin Hongfu Inventor after: Zhang Ruihua Inventor after: Liu Wang Inventor before: Ji Ligong Inventor before: Sun Tonghui Inventor before: Li Changyi Inventor before: Qin Hongfu Inventor before: Zhang Ruihua Inventor before: Liu Wang Inventor before: Xu Hangtao |
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Free format text: CORRECT: INVENTOR; FROM: JI LIGONG SUN TONGHUI LI CHANGYI QIN HONGFU ZHANG RUIHUA LIU WANG XU HANGTAO TO: JI LIGONG XUE QIUYUN ZHANG LIANZHEN SONG YUBING SUN TONGHUI LI CHANGYI QIN HONGFU ZHANG RUIHUA LIU WANG XU HANGTAO ZHANG SIWEI RUAN XIN |
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