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 PDF

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Publication number
CN102527897A
CN102527897A CN2011104623807A CN201110462380A CN102527897A CN 102527897 A CN102527897 A CN 102527897A CN 2011104623807 A CN2011104623807 A CN 2011104623807A CN 201110462380 A CN201110462380 A CN 201110462380A CN 102527897 A CN102527897 A CN 102527897A
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China
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forging
blank
walled
pulling
jumping
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CN2011104623807A
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Chinese (zh)
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CN102527897B (en
Inventor
姬立功
孙统辉
李昌义
秦红付
张瑞华
刘旺
徐航涛
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中信重工机械股份有限公司
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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

The forging method of the short cover type spindle flange of a kind of hydraulic turbine thin-walled step

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.
CN201110462380.7A 2011-12-30 2011-12-30 Forging method for thin-walled step short sleeve type main shaft flange of water turbine CN102527897B (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

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CN110355311A (en) * 2019-06-27 2019-10-22 中信重工机械股份有限公司 A kind of thin-walled band step flange open die forging forming method

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GB561900A (en) * 1942-06-23 1944-06-09 Ti Group Services Ltd Improvements relating to the upsetting of metal tubes, rods or the like
CN1736654A (en) * 2004-08-19 2006-02-22 中国北车集团大同电力机车有限责任公司 Integrated forging method of flange type step thin wall long sheath forging
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CN101979179A (en) * 2010-09-16 2011-02-23 江苏金源锻造股份有限公司 Method for forging thin and short shaft section at end of large-scale step shaft

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GB561900A (en) * 1942-06-23 1944-06-09 Ti Group Services Ltd Improvements relating to the upsetting of metal tubes, rods or the like
CN1736654A (en) * 2004-08-19 2006-02-22 中国北车集团大同电力机车有限责任公司 Integrated forging method of flange type step thin wall long sheath forging
KR100781142B1 (en) * 2007-05-09 2007-12-03 주식회사 신도하이텍 Manufacturing method of a sylindrical bushing
CN101979179A (en) * 2010-09-16 2011-02-23 江苏金源锻造股份有限公司 Method for forging thin and short shaft section at end of large-scale step shaft

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN103212949B (en) * 2013-04-19 2015-09-02 无锡宏达重工股份有限公司 A kind of oblate flange forging technique of full fiber
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
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
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
CN105345410B (en) * 2015-12-02 2018-04-24 四川民盛特钢锻造有限公司 A kind of forging method of fired power generating unit strainer main body special-shaped forge parts
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
CN105880442B (en) * 2016-05-05 2018-02-13 中信重工机械股份有限公司 One kind set forging receives forming method with empty
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
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
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
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
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

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