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Gas turbine blower impeller isothermy die forging method

A gas turbine and isothermal die forging technology, applied in the field of forging, can solve the problems of large centrifugal force, fracture of the impeller, and the inability to meet the requirements of strong and toughness of the impeller, and achieve the effects of reducing the contact friction coefficient, improving the demoulding force of forgings, and increasing the elongation.

Active Publication Date: 2009-03-11
SHANGHAI YUNLIANG ENTERPRISE DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the performance of cast and forged products of this technology is better than that of castings but lower than that of forgings, and even lower than that of isothermal die forgings! This technology cannot complete the manufacture of impellers with speeds as high as 40300 rpm
[0005] The above two technologies cannot solve the isothermal die forging billet of the compressor impeller used in gas turbines. Since the speed of the compressor impeller used in gas turbines is as high as 40300 rpm, the centrifugal force is too large, and it is required to form a complete metal streamline on the impeller blades.
However, the above two technologies cannot meet the strength and toughness requirements of the impeller, and cannot solve the technical problem of easily causing the impeller to break at the vibration pitch line.

Method used

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  • Gas turbine blower impeller isothermy die forging method
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In this embodiment, first determine the isothermal temperature of the 2A50 aluminum alloy mold and the impeller blank, and use the 2A50 forged aluminum alloy material to make a standard sample, and simulate the actual isothermal deformation rate on the 1-5-2 high-temperature material testing machine for a high-temperature tensile test. The plasticity and deformation resistance diagram of the alloy, so as to find the optimal isothermal temperature of the mold and impeller blank: 480°C; creep rate: 5×3.4×10 -4 the s -1 , Isothermal deformation on YA32-500 5000kN hydraulic press. The outer diameter of the blank that will be turned on the lathe 43 is heated to 200°C in a KO-11 box-type resistance furnace, taken out, sprayed with the first lubricant, then placed in the furnace and heated to 480°C, and kept for 80 minutes.

[0028] Then design the mold for isothermal die forging, the mold structure is as follows figure 2 shown. The die 5 is fixed on the lower backing ...

Embodiment 2

[0032] During implementation, use the existing YA32-500 5000kN hydraulic press. The outer diameter of the impeller blank that will be turned on the lathe 43 Heated to 210°C in a KO-11 box-type resistance furnace, took it out, sprayed the first lubricant, then placed it in the furnace and heated it to 490°C, and kept it warm for 80 minutes; heated the mold to 470°C with medium frequency induction, Spray the first lubricant, put the heated impeller blank in the mold, and keep the temperature for 30 seconds, and then the press starts to press down. After about 1 minute, when there is 9mm left, the press slowly presses down for about 4.5 minutes. until the mold is fully closed. The movable beam of the press goes up, the mold is opened, the water-cooled impeller forging (the impeller forging is easily deformed due to heat ejection), and the lower ejector rod 3 ejects the impeller forging.

[0033] In this embodiment, compared with the common die forging, the strength is increa...

Embodiment 3

[0035] During implementation, a YA32-630 6300kN hydraulic press is used. The outer diameter of the impeller blank that will be turned on the lathe Heat it to 190°C in a KO-11 box-type resistance furnace, take it out, spray the first lubricant, put it in the furnace and heat it to 470°C, and keep it warm for 100 minutes; heat the mold to 490°C with medium frequency induction, and spray The first kind of lubricant, put the heated impeller blank in the mold, and then keep the temperature for 20 seconds, and the press starts to press down. After 50 seconds, when there is 10mm left, the press slowly presses down for about 4 minutes until the mold fully closed. The movable beam of the press goes up, the mold is opened, the impeller forging is water-cooled (the impeller forging is easily deformed due to heat ejection), and the lower ejector pin ejects the impeller forging. Because the press is larger than the tonnage of Example 2, the blank temperature can be reduced by 10°C.

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Abstract

The invention relates to a constant temperature die forging method for a gas turbine, a blower impeller, etc in the forging technical field, comprising the following steps: first, blank sheets of the impeller is heated to 190 DEG C-210 DEG C for the first time, and then is taken out and sprayed with lubricant, and then is put into the furnace to be heated to 470 DEG C-490 DEG C for the second time, and finally undergoes a heat preservation of 80-100 minutes; second, the die is once again heated to 470 DEG C-490 DEG C and sprayed with lubricant, then the blank sheets of the impeller after heating is put into the die for heat preservation of 20-40 seconds; third, the die is put into a presser; after the time of pushing for the first time which is 50-70 seconds and when the blank sheets of the impeller in the die are 8-10 millimeters left, the die is slowly pushed for the second time by the presser for 4-5 minutes until completely closed; fourth, a moved cross beam of the presser is made to move upwards; the die is opened; and a impeller forging is pushed out from the lower mandril by a water cooling impeller forging. Compared with a relatively common die forging, the invention has the advantages that the intensity improves over 19 percent; the specific elongation increases over 76 percent; and the service life of the die, the precision and quality of the forging are improved.

Description

technical field [0001] The invention relates to a die forging method in the field of forging technology, in particular to an isothermal die forging method for a gas turbine compressor impeller. Background technique [0002] Forging is one of the basic processes of mechanical manufacturing and an indispensable part of mechanical products. The general trend of the development of the whole forging technology is more refined and more economical, so that it can be used without machining or with a little machining. To achieve the precision of forgings, it is necessary to work hard on the precision forging process. Because precision forgings can reduce economic costs and labor costs compared with ordinary die forgings, the new forging technology is net-shape precision forging, and typical parts are tooth-shaped forging and closed-type forging automotive transmission parts. The application and development of forging gear parts is very fast quick. Isothermal forging refers to a fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23H9/10B23P23/04B21J5/02B21J1/06C10M103/02
Inventor 王以华吴振清
Owner SHANGHAI YUNLIANG ENTERPRISE DEV
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