Gas turbine compressor wheel disc forge piece and forging method thereof

Abstract

The invention relates to a gas turbine compressor wheel disc forge piece and a forging method thereof, belongs to the technical field of forging, and solves the problem that an existing gas turbine compressor wheel disc forge piece forging method cannot meet the high-performance wheel disc flaw detection requirement. The method comprises the following steps: heating a steel ingot or a blank, preserving heat, and upsetting along the axial Z direction; square drawing is conducted in the first radial direction Y, and upsetting is conducted in the first radial direction Y; square drawing is conducted in the second radial direction X, and upsetting is conducted in the second radial direction X; square drawing is conducted in the axial direction Z, and then upsetting is conducted in the axial direction Z; cogging along the axial direction Z to reach the height required by the gas turbine compressor wheel disc forge piece, punching the center of the forge piece, rolling the outer circle, and flattening to obtain the gas turbine compressor wheel disc forge piece. The first radial direction Y and the second radial direction X are perpendicular to the axial direction Z, and the first radial direction Y is perpendicular to the second radial direction X. The grain size of the wheel disc forge piece prepared through the method is uniform and refined, the grain size can reach the 6.5 level, and the whole surface sensitivity 0.7 mm equivalent is detectable.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of forging technology of forgings, in particular to a gas turbine compressor wheel disc forging and a forging method thereof. BACKGROUND

[0002] The gas turbine has the advantages of high thermal efficiency, less pollution, less water consumption, etc., and the gas turbine unit participating in the combined cycle can achieve higher thermal efficiency. The gas turbine wheel disc forging is the basis and guarantee condition of the design and manufacturing technology of advanced gas turbines. Among them, the compressor wheel disc in the gas turbine is an alloy steel pie-shaped forging, which requires pure composition, uniform and refined grains, and ensures that the full surface of the flaw detection reaches 1.0mm of the detectable equivalent requirement.

[0003] The existing forging process of the gas turbine compressor wheel disc forging will cause the mixed grains of the gas turbine compressor wheel disc forging, and the full surface of the flaw detection reaches 1.6mm or even 1.2mm of the equivalent limit, which cannot meet the requirements of high-performance wheel discs. SUMMARY

[0004] In view of the above analysis, the embodiments of the present application aim to provide a gas turbine compressor wheel disc forging and a forging method thereof, to solve the problem that the existing forging method of the gas turbine compressor wheel disc forging cannot meet the flaw detection requirements of high-performance wheel discs.

[0005] In one aspect, the present application provides a forging method of a gas turbine compressor wheel disc forging, the method comprising:

[0006] Step 1: heat the steel ingot or billet and keep warm, and upset along the axial direction Z;

[0007] Step 2: draw square along the first radial direction Y, and then upset along the first radial direction Y;

[0008] Step 3: draw square along the second radial direction X, and then upset along the second radial direction X;

[0009] Step 4: draw square along the axial direction Z, and then upset along the axial direction Z;

[0010] Step 5: open the billet along the axial direction Z to reach the required height of the gas turbine compressor wheel disc forging;

[0011] Step 6: punch a hole in the center of the forging, roll an external circle, and smooth, to obtain the gas turbine compressor wheel disc forging;

[0012] The first radial direction Y and the second radial direction X are perpendicular to the axial direction Z, and the first radial direction Y is perpendicular to the second radial direction X.

[0013] Based on the further improvement of the above method, in step 5, the axial Z opening-up to the height required by the gas turbine compressor wheel disc forging includes: using the strip-shaped hammer head to rotate the open edge to the height required by the gas turbine compressor wheel disc forging.

[0014] Based on the further improvement of the above method, the strip-shaped hammer head rotating open edge includes: the length of the strip-shaped hammer head is greater than the diameter of the forging, and the forging is rotated by an angle after each hammering of the strip-shaped hammer head on the surface of the forging until the height of the entire forging is pressed to the height required by the gas turbine compressor wheel disc forging.

[0015] Based on the further improvement of the above method, the height of each hammering of the strip-shaped hammer head is 90-110mm.

[0016] Based on the further improvement of the above method, the angle of each rotation of the forging is 15°-30°.

[0017] Based on the further improvement of the above method, the center hole of the forging is punched by a punch.

[0018] Based on the further improvement of the above method, the total upsetting ratio of the steel ingot or blank in the axial Z, the first radial Y and the second radial X directions is greater than 1.8.

[0019] Based on the further improvement of the above method, the total drawing ratio of the steel ingot or blank in the axial Z, the first radial Y and the second radial X directions is greater than 1.4.

[0020] Based on the further improvement of the above method, the method adopts a three-fire forging process.

[0021] In another aspect, the present application also provides a gas turbine compressor wheel disc forging prepared by the above forging method.

[0022] Compared with the prior art, the present application can at least achieve one of the following beneficial effects:

[0023] 1、The present application adopts the "three-way upsetting and drawing" method for free forging, which is beneficial to improve the anisotropy of the forging, make the deformation of the entire forging uniform, fully refine the grains, and improve the homogenization of the forging, so as to meet the ultrasonic full-surface ultra-small equivalent detectability of the forging, and achieve the full-surface sensitivity of 0.7mm equivalent detectability.

[0024] 2、In the forging process of the present application, by limiting the total upsetting ratio and the total drawing ratio of the blank in the axial Z, the first radial Y and the second radial X directions, the grains are further refined and the ultrasonic full-surface detectable equivalent sensitivity is improved.

[0025] 3、The present application adopts the mode of rotating the edge of the strip-shaped hammer head to press the height of the whole forging to the required height of the gas turbine compressor wheel disc forging, and combines the height of each hammering of the strip-shaped hammer head and the angle of each rotation of the forging, so that the method is simple and easy to operate, and the forging after the edge is rotated by the strip-shaped hammer head is relatively regular.

[0026] The above technical solutions can be combined with each other in the present application to realize more preferred combination solutions. Other features and advantages of the present application will be described in the subsequent description, and some advantages will become apparent from the description, or will be understood by implementing the present application. The purposes and other advantages of the present application can be realized and obtained from the contents particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings are included to provide a further understanding of the present application, and are incorporated in and constitute a part of this application, illustrate embodiments of the present application and serve to explain the principles of the present application, and are not intended to limit the scope of the present application.

[0028] Figure 1 The forging process diagram of the gas turbine compressor wheel disc forging of the present application.

[0029] Figure 2 The forging process diagram of the existing one-way (axial) upsetting and drawing forging of the gas turbine compressor wheel disc forging.

[0030] Figure 3 The grain size photo of the gas turbine compressor wheel disc forging prepared in Example 1.

[0031] Figure 4 The grain size photo of the gas turbine compressor wheel disc forging prepared in Example 2.

[0032] Figure 5 The grain size photo of the gas turbine compressor wheel disc forging prepared in Comparative Example 1. DETAILED DESCRIPTION

[0033] The preferred embodiments of the present application will be specifically described below in combination with the drawings, wherein the drawings constitute a part of this application, and are used to illustrate the principles of the embodiments of the present application, and are not intended to limit the scope of the present application.

[0034] The existing forging process of the gas turbine compressor wheel disc forging is a free forging process, which is carried out in one direction (axial direction) twice upsetting and drawing (or three times one-way upsetting and drawing), and the opening edge mode is adopted, specifically:

[0035] For example, Figure 2As shown, the one-way (axial) upsetting and drawing process includes: reducing the height of the blank along the axial upsetting, then drawing along the axial direction, completing the first axial upsetting and drawing; continuing to upset the axial drawn blank along the axial direction, then drawing along the axial direction, completing the second axial upsetting and drawing; continuing to upset the axial drawn blank along the axial direction, then drawing along the axial direction, completing the third axial upsetting and drawing; finally, axial upsetting, and then opening the edge to form the finished product.

[0036] However, the existing one-way upsetting and drawing process for preparing the gas turbine compressor wheel disc forging may cause mixed grains, and the full surface of the probe has reached 1.6mm or even 1.2mm equivalent, which is the limit, and cannot meet the requirements of high-performance wheel disc (1.0mm or less can be explored).

[0037] The present application provides a forging method for a gas turbine compressor wheel disc forging, as shown in the accompanying drawings, Figure 1 The method comprises the following steps:

[0038] Step 1: heat the steel ingot or blank and keep warm, and upset along the axial direction Z;

[0039] Step 2: draw along the first radial direction Y, then upset along the first radial direction Y;

[0040] Step 3: draw along the second radial direction X, then upset along the second radial direction X;

[0041] Step 4: draw along the axial direction Z, then upset along the axial direction Z;

[0042] Step 5: open the blank along the axial direction Z to the required height of the gas turbine compressor wheel disc forging;

[0043] Step 6: punch a hole in the center of the forging, roll an external circle, and smooth it to obtain a gas turbine compressor wheel disc forging;

[0044] The first radial direction Y and the second radial direction X are perpendicular to the axial direction Z, and the first radial direction Y is perpendicular to the second radial direction X.

[0045] It should be noted that the axial direction Z is along the center axis of the steel ingot or blank, and the first radial direction Y and the second radial direction X are along the direction perpendicular to the axial direction Z.

[0046] Compared with the prior art, the present application adopts a "three-way upsetting and drawing" method (i.e. upsetting and drawing along the axial direction Z, the first radial direction Y and the second radial direction X respectively) for free forging, which is beneficial to improve the anisotropy of the forging, make the deformation of the entire forging uniform, fully refine the grains, improve the homogenization of the forging, meet the ultrasonic wave full surface ultra-small equivalent detectability of the forging, achieve a full surface sensitivity of 0.7mm equivalent detectable, and meet the requirement that the full surface sensitivity of the high-performance wheel disc shall not exceed 1.0mm.

[0047] Exemplarily, the ingot or the blank can be a cylinder or a prism.

[0048] If the ingot is a cylinder, the axial direction Z is along the central axis of the cylinder, and the first radial direction Y and the second radial direction X are along any two perpendicular diameters of the cross section (circular section) of the cylinder; if the cylinder is a prism and the cross section is a rectangle, the axial direction Z is along the central axis of the prism, and the first radial direction Y and the second radial direction X are along the long side and the short side or the short side and the long side of the rectangular cross section.

[0049] Exemplarily, in step 5, the opening along the axial direction Z to the height required by the gas turbine compressor wheel disc forging includes: using a strip-shaped hammer head to rotate the edge to the height required by the gas turbine compressor wheel disc forging.

[0050] Specifically, the strip-shaped hammer head has a length greater than the diameter of the forging, and the strip-shaped hammer head rotates the forging by an angle after each hammering on the surface of the forging until the height of the entire forging is pressed to the height required by the gas turbine compressor wheel disc forging.

[0051] Exemplarily, the height of each hammering of the strip-shaped hammer head is 90-110 mm. If the height of each hammering is too high, it is difficult to control the flatness of the surface of the forging; if the height of each hammering is too low, it will cause low efficiency.

[0052] It should be noted that the height of the last hammering of the strip-shaped hammer head needs to be determined according to the target height of the forging.

[0053] Exemplarily, the angle of each rotation of the forging is 15°-30°. If the angle of each rotation of the forging is too large, it is difficult to control the flatness of the surface of the forging; if the height of each hammering is too low, it will cause low efficiency.

[0054] Exemplarily, the punching in the center of the forging adopts a punch.

[0055] Exemplarily, the rolling outer circle includes: vertically standing the forging along the radial direction, and using a hammer head to press the outer surface of the forging to be circular. This rolling outer circle method is simple and easy to implement.

[0056] Since the height of the forging in the Z direction will be higher during the rolling outer circle process, the flattening is to press the height of the forging after the rolling outer circle to the height required by the gas turbine compressor wheel disc forging again, and the specific operation method of the flattening can be the same as that of the opening.

[0057] In steps 1 to 4, the temperature of the blank is always kept not lower than 800℃. If the temperature of the blank drops to 800℃, the blank should be returned to the furnace for heating in time.

[0058] In the meantime, the forging fire times should not be too many, otherwise, the grains will be coarse. Therefore, the forging temperature and the forging fire times should be considered together, and the forging process with three fire times can be selected.

[0059] In step 1, the heating temperature is 1200-1270℃.

[0060] Specifically, the steel ingot is heated to 1200-1270℃ in a heating furnace, and is kept for 20-30h, and then the blank is taken out and upset along the axial direction Z (the height direction of the blank) on a large press; then the blank is drawn along the first radial direction Y, and then is upset along the first radial direction Y, to complete the first fire time forging.

[0061] In step 3, the blank is reheated for the second time before being drawn along the second radial direction X.

[0062] In step 3, the heating temperature is 1200-1270℃.

[0063] Specifically, the blank after the first fire time forging is reheated to 1200-1270℃ for the second time, and is kept for 20-30h, and then the blank is taken out and drawn along the second radial direction X on a press, and then is upset along the second radial direction X, and then is drawn along the axial direction Z, to complete the second fire time forging. At this time, the blank has been upset and drawn in the axial direction Z, the first radial direction Y and the second radial direction X.

[0064] Further, in step 4, the blank is reheated for the third time before being upset along the axial direction Z.

[0065] In step 4, the heating temperature is 1200-1270℃.

[0066] Specifically, the blank after the second fire time forging is reheated to 1200-1270℃ for the third time, and is kept for 20-30h, and then the blank is taken out and upset along the axial direction Z on a press, to complete the third fire time forging.

[0067] Further, the blank is processed to have eight corners after each drawing, which is beneficial to the uniform bulging of the blank at the corner part during the upsetting process.

[0068] For the wheel disc forging, step 4 further includes: after being upset along the axial direction Z to a certain height, the wheel disc forging is rotated to open the edge by using a hammer head, to reach the required height of the wheel disc forging, and finally, the wheel disc forging is manufactured by punching a hole in the center, rolling an outer circle and flattening the edges.

[0069] Exemplarily, the total upsetting ratio of the blank in the axial direction Z, the first radial direction Y and the second radial direction X is greater than 1.8, for example, 1.8-4, which is beneficial to the dynamic recrystallization of the forging blank, thereby further refining the grain and improving the ultrasonic full surface detectable equivalent sensitivity.

[0070] Exemplarily, the total upsetting ratio of the blank in the axial direction Z, the first radial direction Y and the second radial direction X is greater than 1.8, for example, 1.8-4, which is beneficial to the dynamic recrystallization of the forging blank, thereby further refining the grain and improving the ultrasonic full surface detectable equivalent sensitivity.

[0071] It should be noted that if the temperature of the blank in the third heating decreases below the final forging temperature (800℃), the forging cannot be completed in one heating, and the blank can be returned to the furnace for heating again, the heating temperature is 1100-1200℃, and the blank is taken out after a certain holding time for forging until the production of the forging is completed.

[0072] It should be noted that the distribution of forging heating times can be adjusted according to the actual temperature of the blank, for example, in the first heating, the temperature of the blank after being drawn in the first radial direction Y has decreased to the final forging temperature, and then the upsetting in the first radial direction Y in the original first heating can be performed in the second heating, and so on, the upsetting in the second radial direction X in the second heating can be performed in the third heating, and therefore, the total forging heating times will increase by one or two times, and therefore, the actual heating times can be determined according to the temperature of the blank on site. However, the more the heating times, the less the grain refinement, and therefore, the heating times should be reduced as much as possible under the condition of ensuring the temperature.

[0073] In a second aspect, the present application further provides a gas turbine compressor wheel disk forging prepared by the above forging method.

[0074] The gas turbine compressor wheel disk forging has an ultrasonic full surface sensitivity of 1.0mm or less equivalent detectable.

[0075] Further, the gas turbine compressor wheel disk forging has a grain size of 6.5, and can have an ultrasonic full surface sensitivity of 0.7mm equivalent detectable.

[0076] Exemplarily, the diameter of the gas turbine compressor wheel disk forging is 1900-2100mm, and the height is 300-400mm. The gas turbine compressor wheel disk forging is an alloy steel containing nickel, chromium, molybdenum and vanadium elements.

[0077] Hereinafter, the gas turbine compressor wheel disk forging and the forging method thereof of the present application will be further described through specific examples.

[0078] In the following examples and comparative examples, the ultrasonic full surface detectable equivalent of the forging is detected by the equivalent method.

[0079] Example 1

[0080] The embodiment provides a gas turbine compressor wheel disc forge and a forging method thereof, and the forge is an alloy steel containing nickel, chromium, molybdenum and vanadium elements.

[0081] The forging method of the gas turbine compressor wheel disc forge comprises the following steps of: Figure 1

[0082] First fire: a cylindrical steel ingot with a cross-sectional diameter of 1250 mm and a height H of 1200 mm is provided, the steel ingot is heated to 1250 DEG C in a heating furnace, and is kept for 25 h, and then the steel ingot is taken out and upset along the axial direction Z by 900 mm on a large press; then the steel ingot is drawn along the first radial direction Y by 900 mm, and is pressed into an octagon, and then is upset along the first radial direction Y by 900 mm, so that the first fire forging is completed.

[0083] Second fire: the blank after the first fire forging is heated to 1250 DEG C in a heating furnace again, and is kept for 25 h, and then the blank is taken out and drawn along the second radial direction X by 900 mm on a press, and is pressed into an octagon, and then is upset along the second radial direction X by 900 mm, and is drawn along the axial direction Z by 900 mm, and is pressed into an octagon, so that the second fire forging is completed. At this time, the blank is subjected to the upsetting and drawing process along the axial direction Z, the first radial direction Y and the second radial direction X.

[0084] Third fire: the blank after the second fire forging is heated to 1250 DEG C in a heating furnace again, and is kept for 20 h, and then the blank is taken out and upset along the axial direction Z by 750 mm on a press, so that the third fire forging is completed. The target height is reached by the way that the hammer head rotates to open the edge, the length of the strip-shaped hammer head is greater than the diameter of the forge, the forge is rotated by an angle every time the strip-shaped hammer head is pressed down once, until the height of the entire forge is pressed to the required height of the gas turbine compressor wheel disc forge, the height of the strip-shaped hammer head is 100 mm every time the strip-shaped hammer head is pressed down, and the angle of the forge is 20 DEG every time the forge is rotated. Finally, the manufacture of the wheel disc forge is completed by punching, rolling and flattening in the center of the forge.

[0085] The total upsetting ratio of the blank along the axial direction Z is 1200 ÷ 900 + 1770 ÷ 750 = 3.66, the total upsetting ratio of the blank along the first radial direction Y is 1800 ÷ 900 = 2, and the total upsetting ratio of the blank along the second radial direction X is 1770 ÷ 900 = 1.97.

[0086] The total drawing ratio of the blank along the axial direction Z is 1770 ÷ 1230 = 1.44, the total drawing ratio of the blank along the first radial direction Y is 1800 ÷ 1250 = 1.44, and the total drawing ratio of the blank along the second radial direction X is 1770 ÷ 1230 = 1.44.

[0087] The first radial direction Y and the second radial direction X are perpendicular to the axial direction Z, and the first radial direction Y is perpendicular to the second radial direction X.

[0088] ​The grain size photograph of the gas turbine compressor wheel disc forging obtained in Example 1 is shown in Figure 3 The grain of the wheel disc forging is uniformly refined, the grain size is 7 levels, and the grain size consistency is good; the full surface detectable equivalent of the ultrasonic flaw detection is 0.7mm of sensitivity.

[0089] Example 2

[0090] The embodiment provides a gas turbine compressor wheel disc forging and a forging method thereof, and the forging is an alloy steel containing nickel, chromium, molybdenum and vanadium elements.

[0091] The forging method of the gas turbine compressor wheel disc forging, as shown in Figure 1 , comprises the following steps.

[0092] First fire: a cylindrical steel ingot with a cross-sectional diameter of 1250mm and a height H of 1200mm is provided, the steel ingot is heated to 1200℃ in a heating furnace, and the blank is taken out after 30h of heat preservation, and is upset along the axial direction Z by 900mm on a large press; then the blank is drawn along the first radial direction Y by 900mm, and is pressed into an octagon, and then is upset along the first radial direction Y by 900mm, and the first fire forging is completed.

[0093] Second fire: the blank after the first fire forging is returned to the furnace for the second heating to 1200℃, and the blank is taken out after 30h of heat preservation, and is drawn along the second radial direction X by 900mm on the press, and is pressed into an octagon, and then is upset along the second radial direction X by 900mm, and is drawn along the axial direction Z by 900mm, and is pressed into an octagon, and the second fire forging is completed. At this time, the blank is subjected to the upsetting and drawing process in the axial direction Z, the first radial direction Y and the second radial direction X.

[0094] Third fire: the blank after the second fire forging is returned to the furnace for the third heating to 1200℃, and the blank is taken out after 30h of heat preservation, and is upset along the axial direction Z by 750mm on the press, and the third fire forging is completed. The target height is reached by the way of rotating the edge of the hammer head, the length of the strip-shaped hammer head is greater than the diameter of the forging, the forging is rotated by an angle every time the strip-shaped hammer head is pressed down by one hammer, until the height of the entire forging is pressed to the required height of the gas turbine compressor wheel disc forging, the height of the strip-shaped hammer head is 100mm every time, and the angle of the forging is 25° every time. Finally, the manufacturing of the wheel disc forging is completed by punching, rolling and flattening in the center of the forging.

[0095] The first radial direction Y and the second radial direction X are perpendicular to the axial direction Z.

[0096] The grain size photograph of the gas turbine compressor wheel disc forging obtained in Example 2 is shown in Figure 4As shown, the grains are uniformly refined, the grain size is 6.5, and the grain size consistency is good; the ultrasonic full-surface detectable equivalent detection is performed, and the result is that the ultrasonic full-surface detectable equivalent of the wheel disc forging is 0.7mm of sensitivity.

[0097] Embodiment 3

[0098] The embodiment provides a gas turbine compressor wheel disc forging and a forging method thereof, and the forging is an alloy steel containing nickel, chromium, molybdenum and vanadium elements.

[0099] The forging method of the gas turbine compressor wheel disc forging, as shown, comprises the following steps. Figure 1

[0100] First fire: a cylindrical steel ingot with a cross-sectional diameter of 1250mm and a height H of 1200mm is provided, the steel ingot is heated to 1270℃ in a heating furnace, and the blank is taken out to be upset by 900mm along the axial direction Z on a large press; then the blank is drawn to a square opening by 900mm along the first radial direction Y, and is pressed into an octagon, and then is upset by 900mm along the first radial direction Y, to complete the first fire forging.

[0101] Second fire: the blank after the first fire forging is returned to the furnace for the second heating to 1270℃, and the blank is taken out to be drawn to a square opening by 900mm along the second radial direction X on the press, and is pressed into an octagon, and then is upset by 900mm along the second radial direction X, and is drawn to a square opening by 900mm along the axial direction Z, to complete the second fire forging. At this time, the blank is subjected to the upsetting and drawing processes in the axial direction Z, the first radial direction Y and the second radial direction X.

[0102] Third fire: the blank after the second fire forging is returned to the furnace for the third heating to 1270℃, and the blank is taken out to be upset by 750mm along the axial direction Z on the press, to complete the third fire forging. The target height is reached by the way of rotating the edge of the hammer head, the length of the strip-shaped hammer head is greater than the diameter of the forging, the forging is rotated by an angle every time the strip-shaped hammer head is pressed down by one hammer, until the height of the entire forging is pressed to the required height of the gas turbine compressor wheel disc forging, the height of the strip-shaped hammer head is 100mm every time, and the angle of the forging is 30° every time. Finally, the center of the forging is punched, the outer circle is rolled, and the surface is flattened to complete the manufacturing of the wheel disc forging.

[0103] The first radial direction Y and the second radial direction X are perpendicular to the axial direction Z.

[0104] The gas turbine compressor wheel disc forging obtained in Embodiment 3 has uniformly refined grains, the grain size is 6.5, and the grain size consistency is good; the ultrasonic full-surface detectable equivalent detection is performed, and the result is that the ultrasonic full-surface detectable equivalent of the wheel disc forging is 0.7mm of sensitivity. ​

[0105] Example 4

[0106] This embodiment provides a gas turbine compressor wheel forging and a forging method thereof. The method is similar to Example 1, except that the total upsetting ratios of the blank in the axial Z, first radial Y, and second radial X directions are all less than 1.8, the total upsetting ratio of the blank in the axial Z direction is 1.75, the total upsetting ratio in the first radial Y direction is 1.5, and the total upsetting ratio in the second radial X direction is 1.5.

[0107] The gas turbine compressor wheel disc forging obtained in Example 4 has a grain size of grade 6. Ultrasonic full-surface detectable equivalent testing was performed, and the result showed that the ultrasonic full-surface detectable equivalent of the wheel disc forging had a sensitivity of 1.0 mm.

[0108] Example 5

[0109] This embodiment provides a gas turbine compressor wheel forging and a forging method thereof. The method is similar to Example 1, except that the total drawing ratios of the blank in the axial Z direction, the first radial Y direction, and the second radial X direction are all less than 1.4. The total drawing ratio of the blank in the axial Z direction is 1.3, the total drawing ratio of the first radial Y direction is 1.3, and the total drawing ratio of the second radial X direction is 1.3.

[0110] The gas turbine compressor wheel disc forging obtained in Example 5 has a grain size of grade 6. Ultrasonic full-surface detectable equivalent testing was performed, and the result showed that the ultrasonic full-surface detectable equivalent of the wheel disc forging had a sensitivity of 1.0 mm.

[0111] Comparative Example 1

[0112] This comparative example provides a gas turbine compressor wheel forging and a forging method thereof, which is a unidirectional forging method, such as Figure 2 Shown, including:

[0113] First forging: Provide a cylindrical steel ingot with a cross-sectional diameter of 1250mm and a height H of 1200mm. Heat the ingot to 1270℃ in a heating furnace and keep it warm for 20 hours. Take out the billet and upset it 900mm along the axial direction Z on a large press; then square it 900mm along the Z direction and press it into an octagonal shape to complete the first forging.

[0114] Second heat: After the first heat, the billet is returned to the furnace for a second heating to 1270°C, held at that temperature for 20 hours, and then upset by 900mm in the Z direction, then squared by 900mm in the axial Z direction, and octagonalized. Next, it is upset by 900mm in the Z direction, then squared by 900mm in the axial Z direction, and octagonalized, completing the second heat. At this point, the billet completes the three-step upsetting and elongation process in the axial Z direction.

[0115] The third time: the billet after the second time of forging is returned to the furnace to be heated to 1270℃, and kept for 20 hours. The billet is taken out and upset by 750mm along the axial direction Z on the press to complete the third time of forging. The target height is reached by the way of rotating the hammer head to open the edge. Finally, the manufacturing of the wheel disc forging is completed by punching in the center of the forging, rolling the outer circle and flattening the edge.

[0116] The grain size photo of the gas turbine compressor wheel disc forging obtained by the comparative example 1 is shown in Figure 5 The uniformity is insufficient, the crystal is mixed, the minimum grain size is 7 levels, and the maximum grain size is 4 levels. The ultrasonic full surface detectable equivalent detection is carried out, and the result is that the ultrasonic full surface detectable equivalent of the wheel disc forging is 1.6mm of sensitivity.

[0117] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A forging method for a gas turbine compressor wheel forging, characterized in that: The method comprises: Step 1: Heat the steel ingot or billet and keep it warm, then upset it in the axial direction Z; Step 2: Squaring along the first radial direction Y, and then upsetting along the first radial direction Y; Step 3: Squaring along the second radial direction X, and then upsetting along the second radial direction X; Step 4: Square along the axial Z direction, and then upsetting along the axial Z direction; Step 5: Open the blank along the axial Z direction to reach the required height of the gas turbine compressor wheel forging; Step 6: Punch a hole in the center of the forging, roll the outer circle, and flatten it to obtain the gas turbine compressor wheel forging; The first radial direction Y and the second radial direction X are respectively perpendicular to the axial direction Z, and the first radial direction Y is perpendicular to the second radial direction X.

2. The forging method according to claim 1, characterized in that In step 5, the blanking along the axial direction Z to achieve the required height of the gas turbine compressor wheel forging includes: using a strip hammer to rotate and open the edge so that the forging reaches the required height of the gas turbine compressor wheel forging.

3. The forging method according to claim 2, characterized in that The method of using a strip hammer head to rotate and open the edge includes: the length of the strip hammer head is greater than the diameter of the forging, and each time the strip hammer head presses down on the forging surface, the forging rotates an angle until the height of the entire forging is pressed to the required height of the gas turbine compressor wheel forging.

4. The forging method according to claim 3, characterized in that The pressing height of each hammer of the strip hammer head is 90-110mm.

5. The forging method according to claim 3, characterized in that: The angle of rotation of the forging is 15°-30° each time.

6. The forging method according to claim 1, wherein: The punching in the center of the forging is performed by using a punch.

7. The forging method according to claim 1, characterized in that The total upsetting ratios of the steel ingot or billet in the axial direction Z, the first radial direction Y, and the second radial direction X are all greater than 1.

8.

8. The forging method according to claim 1, wherein: The total drawing ratios of the steel ingot or billet in the axial direction Z, the first radial direction Y, and the second radial direction X are all greater than 1.

4.

9. The forging method according to claim 1, wherein: The method adopts a three-fire forging process.

10. A gas turbine compressor wheel forging produced by the forging method according to any one of claims 1 to 9.

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