Design method for characteristic parameters of extrusion blank for ensuring dimensional precision of blade forging

Abstract

The design method for the characteristic parameters of the extrusion blank for ensuring the dimensional precision of the blade forging is suitable for determining the blade size and the die size before die forging and comprises the steps that S1, the characteristic parameters of the final blade forging are determined; s2, determining the rod part size of the extrusion blank based on the blade body size and the blade body characteristic surface of the final blade forging; s3, the head size range of the extrusion blank is determined; s4, determining head feature parameters of the extrusion blank based on a numerical simulation method; and S5, the characteristic parameters of the extrusion blank are output, the machining precision of the blade can be improved, and cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of blade forging, and particularly relates to a design method for characteristic parameters of an extrusion blank to ensure the dimensional accuracy of a blade forging. Background Art

[0002] The blade is an important part of an aero-engine and plays a key role in the energy conversion process of a power machine. The blade extrusion process is an important process for blade forging, and the characteristic parameters of the extrusion blank determine the dimensional accuracy of a blade forging with small machining allowance. The traditional method is determined based on experimental experience, resulting in a large dimensional deviation of the finally formed forging, requiring secondary precision machining, and thus leading to a high processing cost. Summary of the Invention

[0003] In view of this, the design method for characteristic parameters of an extrusion blank to ensure the dimensional accuracy of a blade forging provided by the present invention solves the technical problem of the high cost of forging blades by the existing method.

[0004] A design method for characteristic parameters of an extrusion blank to ensure the dimensional accuracy of a blade forging, applicable to determining the blade size and die size before die forging, the design method includes,

[0005] S1: Determine the characteristic parameters of the final blade forging;

[0006] S2: Determine the rod part size of the extrusion blank based on the blade body size and the characteristic surface of the blade body of the final blade forging;

[0007] S3: Determine the head size range of the extrusion blank;

[0008] S4: Determine the head characteristic parameters of the extrusion blank based on the numerical simulation method;

[0009] S5: Output the characteristic parameters of the extrusion blank.

[0010] Advantageous Effects

[0011] Based on analytical calculation, the rod part size and the head size range of the extrusion blank are obtained. According to numerical simulation calculation, the structure and size of the extrusion blank are determined, ensuring the dimensional accuracy of the blade forging. A blank part with high precision is provided before die forging, and the blade has high precision after machining in the stamping stage, without the need for secondary precision machining, greatly reducing the processing cost. Brief Description of the Drawings

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required to be used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0013] Figure 1 It is a flowchart of the process method of the present invention. Specific embodiments

[0014] The embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0015] The following uses specific specific examples to illustrate the implementation manners of the present disclosure. Those skilled in the art can easily understand other advantages and effects of the present disclosure from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. The present disclosure can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present disclosure without making creative efforts belong to the scope of protection of the present disclosure.

[0016] It should be noted that the following describes various aspects of the embodiments within the scope of the appended claims. It should be obvious that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is illustrative only. Based on the present disclosure, those skilled in the art should understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, this device and / or this method can be implemented using other structures and / or functions in addition to one or more of the aspects described herein.

[0017] It should also be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present disclosure in a schematic manner, and only show the components related to the present disclosure rather than being drawn according to the number, shape and size of the components during actual implementation. The type, quantity and ratio of each component during its actual implementation can be an arbitrary change, and the component layout type may also be more complex.

[0018] In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the aspects can be practiced without these specific details.

[0019] As Figure 1 shown, the design method of the extrusion blank characteristic parameters for ensuring the dimensional accuracy of the blade forging is applicable to the determination of the blade size and the die size before die forging. Using the reverse deduction method to form a specific and clear technical solution to reduce the cost of blade processing. The described design method includes,

[0020] S1: Determine the characteristic parameters of the final blade forging. Specifically,

[0021] S101: Based on the three-dimensional forging model, determine the characteristic parameters with the midpoint of the bottom of the final blade forging as the coordinate origin, including the blade body length H2, the position and area S of the characteristic surface of the blade body, the tenon length H1, and the volume V1;

[0022] S2: Determine the rod part dimensions of the extrusion blank based on the blade body dimensions and the characteristic surfaces of the final blade forging. Specifically,

[0023] S201: Determine the rod part length H2 of the blank extrusion blank according to the blade body length H2 of the final forging / , and satisfy: H2 / = H2;

[0024] S202: According to the selected characteristic surfaces M1, M2…Mn of the final forging, and establish a coordinate system with the blade body direction of the final forging as the y-axis coordinate system. The coordinate points of each characteristic surface of the blade body are represented as 1, 2, 3,... n. Calculate the areas S1, S2…Sn of all characteristic surfaces of the blade body through simulation software respectively. It should be noted that: the dimensions of the final forging are required by the design, and the areas of each coordinate point can be determined;

[0025] S203: According to the areas of the characteristic surfaces of the blade body, determine the radii R1, R2…Rn of each coordinate point through the circular area calculation formula. Among them, R1 is the radius at the initial position of the transition between the tenon and the blade body, and Rn is the radius at the outermost edge position of the blade body;

[0026] S204: Determine the radius Rn of the rod part of the extrusion blank of the blade before die forging on the y-axis / , satisfy:

[0027] R1 / = R1, R2 / = R2……Rn / = Rn;

[0028] S3: Determine the range of the head dimensions of the extrusion blank. Specifically,

[0029] S301: Establish the head volume V O calculation formula of the extrusion blank, satisfy V O = πR O 2 H O , where, R O is the radius of the blank head, and H O is the length of the blank head;

[0030] S302: Establish the relationship between the radius of the blank head and the average radius of the blank rod based on the extrusion ratio, satisfying:

[0031] S303: Establish the relationship between the length H1 of the tenon head and the length H0 of the blank head, satisfying: H1 ≥ H0 ≥ H1 / 2;

[0032] S304: Determine that the volume V0 of the head is the volume of the tenon head based on the principle of constant volume, satisfying: V0 = V1;

[0033] S305: Substitute steps S302 - S304 into step S301 to obtain the value ranges of the radius R0 and the length H0 of the blank head;

[0034] S4: Determine the head characteristic parameters of the extrusion blank based on the numerical simulation method. Specifically,

[0035] S401: Design a central experimental plan for the value range. The central experimental plan design is based on the conventional design method in scientific and technological research, and multiple test plans for the blank head can be obtained. Further, multiple test plans need to be screened to select the optimal one;

[0036] S402: According to all test plans, radius Rn / Use the simulation method to determine the structures and dimensions of multiple extrusion blanks before die forging;

[0037] S403: Determine the structures and dimensions of multiple extrusion dies according to the structures and dimensions of all extrusion blanks using the simulation method;

[0038] S404: Establish a three-dimensional model based on the structures and dimensions of multiple extrusion dies and conduct numerical simulation to obtain multiple simulation data;

[0039] S405: Compare the multiple simulation data with the structures and dimensions of the extrusion blanks determined in each plan in step S402, and use the software and the ratio method to determine R0 and H0 corresponding to the plan with the highest accuracy. Finally, these parameters are used as the best parameters for the corresponding signal blades for processing die dimensions, etc.

[0040] S5: Output the characteristic parameters of the extrusion blank. Specifically, R0 and H0 corresponding to the plan with the highest accuracy are saved or output as the characteristic parameters of the extrusion blank, and are used as the initial blank parts for processing the "final forging" in the next stage. The present invention proposes a method for qualitatively determining the range of key parameters of the extrusion blank, which is applicable to blades of various structures and dimensions, replaces the traditional method of determining parameters by experience, reduces the possibility of secondary precision machining of the blades, improves the manufacturing efficiency of the blades, and reduces the processing cost.

[0041] For example: The processing of a certain type of blade for an aero-engine includes the following steps:

[0042] 1) Taking the midpoint at the bottom of the blade forging as the coordinate origin, determine the characteristic dimension parameters of the blade forging, including the length H2 of the blade body, the position and area S of the characteristic surface of the blade body, the length H1 of the tenon head, and the volume V1.

[0043] 2) Based on the dimensions of the blade body and the characteristic surface of the blade body, determine the rod dimensions of the extrusion blank, specifically including the following steps:

[0044] 2.1) According to the blade body length H2 = 80 mm, determine the rod length H2 of the extrusion blank to be 80 mm.

[0045] 2.2) According to the selected characteristic surfaces M1, M2... M 11 , calculate their areas S1 = 176.625 mm 2 , S2 = 177.804 mm 2 ... S n = 200.96 mm 2 .

[0046] 2.3) According to the area of the characteristic surface of the blade body, calculate the corresponding radii R1 = 7.5 mm, R2 = 7.525 mm... R through the formula n = 8 mm.

[0047] 2.4) According to the position of the characteristic surface of the blade body, correspondingly determine the radius of the rod of the extrusion blank

[0048] Further, in step 3), based on the tenon head dimensions and volume, determine the head size range of the extrusion blank, specifically including the following steps:

[0049] 3.1) Establish a calculation formula for the head volume V0 of the extrusion blank: V0 = πR0 2 H0, where R R is the radius of the blank head, and H0 is the length of the blank head.

[0050] 3.2) Based on the extrusion ratio, establish the relationship between the radius of the blank head and the average radius of the blank rod: 23.25 mm ≥ R0 ≥ 15.5 mm.

[0051] 3.3) Establish the relationship between the tenon head length H1 and the blank head length H0: 23 mm ≥ H0 ≥ 11.5 mm.

[0052] 3.4) Based on the principle of volume invariance, determine that the head volume V0 is the tenon head volume: V0 = V1 = 21557.335 mm 3 .

[0053] 3.5) Substitute the steps 3.2) - 3.4) into the formula in step 3.1) to obtain the ranges of R0 and H0, 23.25 mm ≥ R0 ≥ 17.277 mm, 23 mm ≥ H0 ≥ 12.7 mm.

[0054] In 4), determine the head characteristic parameters of the extrusion blank based on numerical simulation, specifically including the following steps:

[0055] 4.1) Design a central experimental plan according to the ranges of the blank head radius R0 and the blank head length H0 determined in step 3).

[0056] 4.2) Determine the structure and dimensions of the extrusion blank for each plan according to the experimental plan in step 4.1) and the dimensions of the extrusion rod part in step 2).

[0057] 4.3) Determine the structure and dimensions of the extrusion die for each plan according to the structure and dimensions of the extrusion blank.

[0058] 4.4) Establish a three-dimensional model according to the structure and dimensions of the extrusion die in step 4.3), so as to perform numerical simulation on each plan.

[0059] 4.5) Compare the structure and dimensions in the results of each plan in step 4.4) with the structure and dimensions of the extrusion blank determined for each plan in step 4.2), and obtain R0 = 20 mm and H0 = 17 mm corresponding to the plan with the highest accuracy.

[0060] 5) Further, in step 5), output the structure and dimensions of the extrusion blank.

[0061] As described above, it is only the specific implementation manner of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present disclosure should be covered by the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A design method for characteristic parameters of extrusion billets to ensure the dimensional accuracy of blade forgings, applicable to the determination of blade dimensions and die dimensions before die forging, is characterized in that, The described design method includes: S1: Determine the characteristic parameters of the final blade forging. S2: Based on the blade body dimensions and the characteristic surfaces of the blade body of the final blade forging, determine the rod part dimensions of the extrusion blank. S3: Determine the range of the head dimensions of the extrusion blank. S4: Based on the numerical simulation method, determine the characteristic parameters of the head of the extrusion blank. S5: Output the characteristic parameters of the extrusion blank.

2. The design method according to claim 1, characterized in that, S1 includes: S101: Based on the three-dimensional forging model, determine the characteristic parameters with the midpoint of the bottom of the final blade forging as the coordinate origin, including the blade body length H2, the position and area S of the characteristic surface of the blade body, the tenon length H1, and the volume V1.

3. The design method according to claim 2, characterized in that S2 includes: S201: Determine the rod length H2 of the blank extrusion billet according to the blade length H2 of the final forging / , and satisfy: H2 / = H2; S202: According to the selected characteristic surfaces M1, M2... Mn of the blade body of the final forging, and establish a coordinate system with the blade body direction of the final forging as the y-axis coordinate system, and calculate the areas S1, S2... Sn of all the characteristic surfaces of the blade body through the simulation software respectively. S203: According to the areas of the characteristic surfaces of the blade body, determine the radii R1, R2... Rn of each coordinate point through the circular area calculation formula, where R1 is the radius of the initial position of the transition between the tenon and the blade body, and Rn is the radius of the outermost edge position of the blade body. S204: Determine the radius Rn of the rod part of the extrusion blank of the blade before die forging on the y-axis / , satisfying: R1 / = R1, R2 / = R2……Rn / = Rn。 4. The design method according to claim 3, characterized in that, S3 includes: S301: Establish the head volume V of the extruded blank O Calculation formula, satisfying V O = πR O 2 H O , where R O is the head radius of the blank, and H O is the head length of the blank; S302: Establish the relationship between the head radius of the blank and the average radius of the rod part of the blank based on the extrusion ratio, satisfying: S303: Establish the relationship between the tenon length H1 and the head length H0 of the blank, satisfying: H1 ≥ H0 ≥ H1 / 2. S304: Based on the principle of constant volume, determine that the head volume V0 is the tenon volume, satisfying: V0 = V1. S305: Substitute steps S302 - S304 into step S301 to obtain the value ranges of the blank head radius R0 and the blank head length H0.

5. The design method according to claim 4, wherein S4 includes: S401: Design a central experimental plan for the value range to obtain multiple experimental plans for the batching head. S402: Determine the structures and dimensions of multiple extruded blanks before die forging according to all the test schemes and the radius Rn / Determine the structures and dimensions of multiple extruded blanks before die forging; S403: Determine the structures and dimensions of multiple extrusion dies according to the structures and dimensions of all the extrusion blanks. S404: Establish a three-dimensional model based on the structures and dimensions of multiple extrusion dies and conduct numerical simulation to obtain multiple simulation data. S405: Compare the multiple simulation data with the structures and dimensions of the extrusion blanks determined in each plan in step S402, and determine R0 and H0 corresponding to the plan with the highest accuracy through the ratio method.

6. The design method according to claim 5, wherein S5 includes: Save or output R0 and H0 corresponding to the plan with the highest accuracy as the characteristic parameters of the extrusion blank.

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