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Forging method for thin-walled step short sleeve type main shaft flange of water turbine

A water turbine and thin-walled technology, which is applied in the forging field of the main shaft flange of the thin-walled step short sleeve of the water turbine, can solve the problems of increasing the weight of the forging, the reduction of the axial mechanical properties, and the prolongation of the processing cycle of the parts. The effects of uneven metal flow, reduced machining volume, and improved material utilization

Active Publication Date: 2012-07-04
CITIC HEAVY INDUSTRIES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. For the lower flange parts with large steps, forging ring forgings greatly increases the weight of forgings and the workload of machining after forging, resulting in huge waste of material utilization and prolonging the processing cycle of parts, which in turn also doubled the cost of production
[0004] 2. After being forged into a ring forging, the metal flow line of the forging will be cut off during the machining process, resulting in the overall forging, especially the axial mechanical properties of the flange part being greatly reduced

Method used

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  • Forging method for thin-walled step short sleeve type main shaft flange of water turbine
  • Forging method for thin-walled step short sleeve type main shaft flange of water turbine
  • Forging method for thin-walled step short sleeve type main shaft flange of water turbine

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Experimental program
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Effect test

Embodiment 1

[0030] Embodiment 1: A method for forging a main shaft flange of a thin-walled step short sleeve of a water turbine, the specific steps are as follows:

[0031] Step 1. Using steel ingots as raw materials, upsetting the steel ingots by a forging press, the amount of upsetting reduction is 50% of the length of the steel ingot body; after drawing, the ratio of the length after drawing to the length before drawing is 2.2 Between, after cutting off the material;

[0032] Step 2. Upsetting the billet processed in Step 1 to the size of the forging, and then punching with a punch for standby;

[0033] Step 3. Insert the horse bar into the inner hole of the billet, and carry out rounding and reaming on the billet on the horse bar. The ratio of the diameter after reaming to the diameter before reaming is between 1.2;

[0034] Step 4: Insert a mandrel into the blank, use symmetrical upper and lower V-shaped anvils to elongate the blank to the required size, and then press the blank out...

Embodiment 2

[0036] Embodiment 2: A method for forging the main shaft flange of the thin-walled step short sleeve of a water turbine, the specific steps are as follows:

[0037] Step 1. Using steel ingots as raw materials, upsetting the steel ingots by a forging press, the amount of upsetting reduction is 60% of the length of the steel ingot body; after drawing, the ratio of the length after drawing to the length before drawing is 2.0 Between, after cutting off the material;

[0038] Step 2. Upsetting the billet processed in Step 1 to the size of the forging, and then punching with a punch for standby;

[0039] Step 3. Insert the horse bar into the inner hole of the billet, and carry out rounding and reaming on the billet on the horse bar. The ratio of the diameter after reaming to the diameter before reaming is between 1.25;

[0040] Step 4: Insert a mandrel into the blank, use symmetrical upper and lower V-shaped anvils to elongate the blank to the required size, and then press the blan...

Embodiment 3

[0042] Embodiment 3: A method for forging a main shaft flange with thin-walled steps and short sleeves of a water turbine. The specific steps are as follows:

[0043] Step 1. Using steel ingots as raw materials, upsetting the steel ingots by a forging press, the amount of upsetting reduction is 70% of the length of the steel ingot body; after drawing, the ratio of the length after drawing to the length before drawing is 2.1 Between, after cutting off the material;

[0044] Step 2. Upsetting the billet processed in Step 1 to the size of the forging, and then punching with a punch for standby;

[0045] Step 3. Insert the horse bar into the inner hole of the billet, and carry out rounding and reaming on the billet on the horse bar. The ratio of the diameter after reaming to the diameter before reaming is between 1.35;

[0046] Step 4: Insert a mandrel into the blank, use symmetrical upper and lower V-shaped anvils to elongate the blank to the required size, and then press the bl...

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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 [0001] The invention belongs to the field of forging main shaft flanges, and in particular relates to a forging method for a main shaft flange of a water turbine with thin-walled steps and short sleeves. Background technique [0002] The main shaft of a large water turbine is one of the main components of hydropower equipment, and the forging of the main shaft flange has steps, such as figure 1 The structure shown, as a thin-walled stepped short sleeve forging, its length is only about half of the diameter, relatively short, and forging is very difficult. Therefore, under normal circumstances, the forging adopts the addition of dressing to figure 2 The ring forgings shown are formed by forging. This forging process greatly reduces the difficulty of forging manufacturing, but there are also two major problems as described below: [0003] 1. For the lower flange parts with large steps, forging ring forgings greatly increases the weight of forgings and the w...

Claims

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Application Information

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IPC IPC(8): B21J5/08B21J5/06B23P15/00
Inventor 姬立功孙统辉李昌义秦红付张瑞华刘旺徐航涛
Owner CITIC HEAVY INDUSTRIES CO LTD
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